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<h2 id="dgtt"><a href="rbafzmst02.htm#ToC_977">DECLARE GLOBAL TEMPORARY TABLE</a></h2><a id="idx2228" name="idx2228"></a><a id="idx2229" name="idx2229"></a><a id="idx2230" name="idx2230"></a>
<p>The DECLARE GLOBAL TEMPORARY TABLE statement defines a declared temporary
table for the current application process. The declared temporary table description
does not appear in the system catalog. It is not persistent and cannot be
shared with other application processes. Each application process that defines
a declared global temporary table of the same name has its own unique description
of the temporary table. When the application process ends, the temporary table
is dropped.</p>
<a name="wq1390"></a>
<h3 id="wq1390"><a href="rbafzmst02.htm#ToC_978">Invocation</a></h3>
<p>This statement can be embedded in an application program or issued interactively.
It is an executable statement that can be dynamically prepared.</p>
<a name="wq1391"></a>
<h3 id="wq1391"><a href="rbafzmst02.htm#ToC_979">Authorization</a></h3>
<p>If the LIKE or AS <var class="pv">select-statement</var> clause is specified, the privileges
held by the authorization ID of the statement must include at least one of
the following on any table or view specified in the LIKE clause or as-subquuery
clause: </p>
<ul>
<li>The SELECT privilege for the table or view</li>
<li>Ownership of the table or view</li>
<li>Administrative authority</li></ul>
<p>If a distinct type is referenced, the privileges held by the authorization ID of
the statement must include at least one of the following: </p>
<ul>
<li>For each distinct type identified in the statement:
<ul>
<li>The USAGE privilege on the distinct type, and</li>
<li>The system authority *EXECUTE on the library containing the distinct type</li></ul></li>
<li>Administrative authority</li></ul>
<p>For information on the system authorities corresponding to SQL privileges,
see <a href="rbafzmstgnt.htm#eqtablet">Corresponding System Authorities When Checking Privileges to a Table or View</a> and <a href="rbafzmstgntudtp.htm#eqtabled">Corresponding System Authorities When Checking Privileges to a Distinct Type</a>.</p>
<a name="wq1392"></a>
<h3 id="wq1392"><a href="rbafzmst02.htm#ToC_980">Syntax</a></h3>
<a href="rbafzmstdgtt.htm#synsdgtt"><img src="c.gif" alt="Click to skip syntax diagram" /></a>
<a name="wq1393"></a>
<div class="fignone" id="wq1393">
<pre class="cgraphic"><span><img src="c.gif" alt="Read syntax diagram" longdesc="rbafzmstsyn316.htm"
border="0" /></span><a href="#skipsyn-315"><img src="c.gif" alt="Skip visual syntax diagram"
border="0" /></a>>>-DECLARE GLOBAL TEMPORARY TABLE--<span class="italic">table-name</span>------------------->
.-,------------------------------------------.
V |
>--+-(----+-<span class="italic">column-definition</span>----------------------+-+--)-+----->
| '-LIKE--+-<span class="italic">table-name</span>-+--+--------------+-' |
| '-<span class="italic">view-name</span>--' '-<span class="italic">copy-options</span>-' |
+-LIKE--+-<span class="italic">table-name</span>-+--+--------------+---------------+
| '-<span class="italic">view-name</span>--' '-<span class="italic">copy-options</span>-' |
'-<span class="italic">as-subquery-clause</span>-----------------------------------'
.-----------------------------------------------.
V | (1)
>----+-WITH REPLACE------------------------------+-+----------->&lt;
| .-ON COMMIT DELETE ROWS---. |
+-+-------------------------+---------------+
| '-ON COMMIT PRESERVE ROWS-' |
| .-ON ROLLBACK DELETE ROWS---. |
'-NOT LOGGED--+---------------------------+-'
'-ON ROLLBACK PRESERVE ROWS-'
column-definition:
|--<span class="italic">column-name</span>--+-------------------------------------+--------->
| .-COLUMN-. |
'-FOR--+--------+--<span class="italic">system-column-name</span>-'
>--<span class="italic">data-type</span>---------------------------------------------------->
.-----------------------------------------------------.
V | (1)
>----+-------------------------------------------------+-+-------|
+-+-<span class="italic">default-clause</span>------------------------------+-+
| +-<span>GENERATED</span>--+-<span>ALWAYS</span>-----+--<span><span class="italic">identity-options</span></span>-+ |
| | '-<span>BY DEFAULT</span>-' | |
| '-NOT NULL------------------------------------' |
| (2) |
'-<span class="italic">datalink-options</span>--------------------------------'
data-type:
|--+-<span class="italic">built-in-type</span>------+---------------------------------------|
'-<span class="italic">distinct-type-name</span>-'
</pre>
<a name="skipsyn-315" id="skipsyn-315"></a>
<a name="wq1394"></a>
<div class="notelisttitle" id="wq1394">Notes:</div>
<ol type="1">
<li>The same clause must not be specified more than once.</li>
<li>The datalink-options can only be specified for DATALINKs and distinct-types
sourced on DATALINKs.</li>
</ol></div>
<a name="wq1396"></a>
<div class="fignone" id="wq1396">
<pre class="cgraphic"><span><img src="c.gif" alt="Read syntax diagram" longdesc="rbafzmstsyn317.htm"
border="0" /></span><a href="#skipsyn-316"><img src="c.gif" alt="Skip visual syntax diagram"
border="0" /></a>built-in-type:
|--+-+---SMALLINT---+-----------------------------------------------------------------------------------------------+--|
| +-+-INTEGER-+--+ |
| | '-INT-----' | |
| '---BIGINT-----' |
| .-(5,0)------------------------. |
+-+-+-DECIMAL-+-+--+------------------------------+--------------------------------------------------------------+
| | '-DEC-----' | | .-,0--------. | |
| '-NUMERIC-----' '-(--<span class="italic">integer</span>--+-----------+--)-' |
| '-<span class="italic">, integer</span>-' |
| .-(--52--)------. |
+-+-FLOAT--+---------------+-+-----------------------------------------------------------------------------------+
| | '-(--<span class="italic">integer</span>--)-' | |
| +-REAL---------------------+ |
| | .-PRECISION-. | |
| '-DOUBLE--+-----------+----' |
| .-(--1--)-------. |
+-+-+-+-CHARACTER-+--+---------------+-------------------------------+--+----------------+---------------------+-+
| | | '-CHAR------' '-(--<span class="italic">integer</span>--)-' | +-FOR BIT DATA---+ | |
| | '-+-+-CHARACTER-+--VARYING-+--(--<span class="italic">integer</span>--)--+-----------------+-' +-FOR SBCS DATA--+ | |
| | | '-CHAR------' | '-<span class="italic">allocate-clause</span>-' +-FOR MIXED DATA-+ | |
| | '-VARCHAR----------------' '-<span class="italic">ccsid-clause</span>---' | |
| | .-(--1M--)-------------. | |
| '-----+-+-<span>CHARACTER</span>-+--<span>LARGE OBJECT</span>-+------+----------------------+--+-----------------+--+----------------+-' |
| | '-<span>CHAR</span>------' | '-(--<span class="italic">integer</span>--+---+--)-' '-<span class="italic">allocate-clause</span>-' +-FOR SBCS DATA--+ |
| '-<span>CLOB</span>------------------------' +-K-+ +-FOR MIXED DATA-+ |
| +-M-+ '-<span class="italic">ccsid-clause</span>---' |
| '-G-' |
| .-(--1--)-------. |
+-+---GRAPHIC----+---------------+----------------------------+--+--------------+--------------------------------+
| | '-(--<span class="italic">integer</span>--)-' | '-<span class="italic">ccsid-clause</span>-' |
| +-+-GRAPHIC VARYING-+--(--<span class="italic">integer</span>--)--+-----------------+---+ |
| | '-VARGRAPHIC------' '-<span class="italic">allocate-clause</span>-' | |
| | .-(--1M--)-------------. | |
| '---DBCLOB----+----------------------+--+-----------------+-' |
| '-(--<span class="italic">integer</span>--+---+--)-' '-<span class="italic">allocate-clause</span>-' |
| +-K-+ |
| +-M-+ |
| '-G-' |
| .-(--1--)-------. |
+-+-+-BINARY--+---------------+------------------------------+-----------------+---------------------------------+
| | | '-(--<span class="italic">integer</span>--)-' | | |
| | '-+-BINARY VARYING-+--(--<span class="italic">integer</span>--)--+-----------------+-' | |
| | '-VARBINARY------' '-<span class="italic">allocate-clause</span>-' | |
| | .-(--1M--)-------------. | |
| '---+-BLOB----------------+----+----------------------+--+-----------------+-' |
| '-BINARY LARGE OBJECT-' '-(--<span class="italic">integer</span>--+---+--)-' '-<span class="italic">allocate-clause</span>-' |
| +-K-+ |
| +-M-+ |
| '-G-' |
+-+-DATE------+--------------------------------------------------------------------------------------------------+
| +-TIME------+ |
| '-TIMESTAMP-' |
| .-(--200--)-----. |
'---DATALINK--+---------------+--+-----------------+--+--------------+-------------------------------------------'
'-(--<span class="italic">integer</span>--)-' '-<span class="italic">allocate-clause</span>-' '-<span class="italic">ccsid-clause</span>-'
ccsid-clause:
.-NOT NORMALIZED-.
|--CCSID--<span class="italic">integer</span>--+----------------+---------------------------|
'-NORMALIZED-----'
allocate-clause:
|--ALLOCATE--<span class="italic">(integer)</span>------------------------------------------|
</pre>
<a name="skipsyn-316" id="skipsyn-316"></a></div>
<a name="wq1397"></a>
<div class="fignone" id="wq1397">
<pre class="cgraphic"><span><img src="c.gif" alt="Read syntax diagram" longdesc="rbafzmstsyn318.htm"
border="0" /></span><a href="#skipsyn-317"><img src="c.gif" alt="Skip visual syntax diagram"
border="0" /></a>default-clause:
.-WITH-.
|--+------+--DEFAULT--+-------------------------------------------------+--|
+-<span class="italic">constant</span>----------------------------------------+
+-USER--------------------------------------------+
+-NULL--------------------------------------------+
+-CURRENT_DATE------------------------------------+
+-CURRENT_TIME------------------------------------+
+-CURRENT_TIMESTAMP-------------------------------+
'-<span class="italic">cast-function-name</span>--(--+-<span class="italic">constant</span>----------+--)-'
+-USER--------------+
+-CURRENT_DATE------+
+-CURRENT_TIME------+
'-CURRENT_TIMESTAMP-'
identity-options:
|--AS IDENTITY--+-------------------------------------------------------+--|
| .-,-------------------------------------------. |
| V .-<span class="italic">1</span>----------------. (1) | |
'-(----+-START WITH--+-<span class="italic">numeric-constant</span>-+---+------+--)-'
| .-<span class="italic">1</span>----------------. |
+-INCREMENT BY--+-<span class="italic">numeric-constant</span>-+-+
| .-NO MINVALUE----------------. |
+-+-MINVALUE--<span class="italic">numeric-constant</span>-+-----+
| .-NO MAXVALUE----------------. |
+-+-MAXVALUE--<span class="italic">numeric-constant</span>-+-----+
| .-NO CYCLE-. |
+-+-CYCLE----+-----------------------+
| .-CACHE--<span class="italic">20</span>------. |
+-+-NO CACHE-------+-----------------+
| '-CACHE--<span class="italic">integer</span>-' |
| .-NO ORDER-. |
'-+-ORDER----+-----------------------'
</pre>
<a name="skipsyn-317" id="skipsyn-317"></a>
<a name="wq1398"></a>
<div class="notelisttitle" id="wq1398">Notes:</div>
<ol type="1">
<li>The same clause must not be specified more than once.</li>
</ol></div>
<a name="wq1400"></a>
<div class="fignone" id="wq1400">
<pre class="cgraphic"><span><img src="c.gif" alt="Read syntax diagram" longdesc="rbafzmstsyn319.htm"
border="0" /></span><a href="#skipsyn-318"><img src="c.gif" alt="Skip visual syntax diagram"
border="0" /></a>datalink-options:
.-LINKTYPE URL-. .-NO LINK CONTROL-.
|--+--------------+--+-----------------+------------------------|
copy-options:
.-COLUMN ATTRIBUTES-. .-COLUMN-. (1)
|----+-EXCLUDING IDENTITY--+-------------------+-+--+-EXCLUDING--+--------+--DEFAULTS-+---------|
| .-COLUMN ATTRIBUTES-. | | .-COLUMN-. |
'-INCLUDING IDENTITY--+-------------------+-' +-INCLUDING--+--------+--DEFAULTS-+
'-USING TYPE DEFAULTS-------------'
as-subquery-clause:
|--+----------------------------------------------------------------+-->
| .------------------------------------------------------. |
| V | |
'-(----<span class="italic">column-name</span>--+-------------------------------------+-+--)-'
| .-COLUMN-. |
'-FOR--+--------+--<span class="italic">system-column-name</span>-'
>--AS--(--<span class="italic">select-statement</span>--)--+-WITH NO DATA-+--+--------------+--|
'-WITH DATA----' '-<span class="italic">copy-options</span>-'
</pre>
<a name="skipsyn-318" id="skipsyn-318"></a>
<a name="wq1401"></a>
<div class="notelisttitle" id="wq1401">Notes:</div>
<ol type="1">
<li>The clauses can be specified in any order.</li>
</ol></div>
<a name="synsdgtt"></a>
<h3 id="synsdgtt"><a href="rbafzmst02.htm#ToC_981">Description</a></h3>
<dl class="parml">
<dt class="bold"><var class="pv">table-name</var></dt>
<dd>Names the temporary table. <a id="idx2231" name="idx2231"></a> The qualifier,
if specified explicitly, must be SESSION, otherwise an error is returned.
If the qualifier is not specified, it is implicitly defined to be SESSION.
If a declared temporary table, or an index or view that is dependent on a
declared temporary table already exists with the same name, an error is returned.
<p>If a persistent table, view, index, or alias already exists with the same
name and the schema name SESSION:</p>
<ul>
<li>The declared temporary table is still defined with SESSION.<var class="pv">table-name</var>. An error is not issued because the resolution of a declared temporary
table name does not include a permanent library.</li>
<li>Any references to SESSION.<var class="pv">table-name</var> will resolve to the declared
temporary table rather than to a permanent table, view, index, or alias with
a name of SESSION.<var class="pv">table-name</var>.</li></ul>
<p>The table will be created in library QTEMP.</p>
</dd>
</dl>
<a name="wq1403"></a>
<h3 id="wq1403"><a href="rbafzmst02.htm#ToC_982">column-definition</a></h3>
<p>Defines the attributes of a column. There must be at least one column definition
and no more than 8000 column definitions.</p>
<p>The sum of the row buffer byte counts of the columns must not be greater
than 32766 or, if a VARCHAR or VARGRAPHIC column is specified, 32740. Additionally,
if a LOB is specified, the sum of the row data byte counts of the columns
must not be greater than 3.5 gigabytes. For information on the byte counts
of columns according to data type, see <a href="rbafzmsthctabl.htm#unctabl">Notes</a>.</p>
<dl class="parml">
<dt class="bold"><var class="pv">column-name</var> </dt><a id="idx2232" name="idx2232"></a>
<dd>Names a column of the table. Do not qualify <var class="pv">column-name</var> and
do not use the same name for more than one column of the table or for a system-column-name
of the table.
</dd>
<dt class="bold">FOR COLUMN <var class="pv">system-column-name</var> </dt><a id="idx2233" name="idx2233"></a><a id="idx2234" name="idx2234"></a>
<dd>Provides an i5/OS name for the column. Do not use the same name for
more than one column of the table or for a column-name of the table. <a id="idx2235" name="idx2235"></a>
<p>If the system-column-name is
not specified, and the column-name is not a valid system-column-name, a system
column name is generated. For more information about how system column names
are generated, see <a href="rbafzmsthctabl.htm#cnamrul">Rules for Column Name Generation</a>.</p>
</dd>
<dt class="bold"><var class="pv">data-type</var></dt><a id="idx2236" name="idx2236"></a><a id="idx2237" name="idx2237"></a><a id="idx2238" name="idx2238"></a><a id="idx2239" name="idx2239"></a><a id="idx2240" name="idx2240"></a><a id="idx2241" name="idx2241"></a><a id="idx2242" name="idx2242"></a><a id="idx2243" name="idx2243"></a><a id="idx2244" name="idx2244"></a><a id="idx2245" name="idx2245"></a><a id="idx2246" name="idx2246"></a><a id="idx2247" name="idx2247"></a><a id="idx2248" name="idx2248"></a><a id="idx2249" name="idx2249"></a><a id="idx2250" name="idx2250"></a><a id="idx2251" name="idx2251"></a><a id="idx2252" name="idx2252"></a><a id="idx2253" name="idx2253"></a><a id="idx2254" name="idx2254"></a><a id="idx2255" name="idx2255"></a><a id="idx2256" name="idx2256"></a><a id="idx2257" name="idx2257"></a><a id="idx2258" name="idx2258"></a><a id="idx2259" name="idx2259"></a><a id="idx2260" name="idx2260"></a>
<dd>Specifies the data type of the column.
<dl class="parml">
<dt class="bold"><var class="pv">built-in-type</var> </dt><a id="idx2261" name="idx2261"></a>
<dd>Specifies a built-in data type. See <a href="rbafzmsthctabl.htm#hctabl">CREATE TABLE</a> for a description
of <span class="italic">built-in-type</span>.
<p>A ROWID column or a DATALINK column
with FILE LINK CONTROL cannot be specified for a global temporary table.</p>
</dd>
<dt class="bold"><var class="pv">distinct-type-name</var> </dt><a id="idx2262" name="idx2262"></a>
<dd>Specifies that the data type of the column is a distinct type (a user-defined
data type). The length, precision, and scale of the column are respectively
the length, precision, and scale of the source type of the distinct type.
If a distinct type name is specified without a schema name, the distinct type
name is resolved by searching the schemas on the SQL path.
</dd>
</dl>
</dd>
<dt class="bold">NOT NULL </dt><a id="idx2263" name="idx2263"></a>
<dd>Prevents the column from containing null values. Omission of NOT NULL
implies that the column can be null.
</dd>
<dt class="bold"><a id="crtdft2" name="crtdft2"></a>DEFAULT </dt><a id="idx2264" name="idx2264"></a><a id="idx2265" name="idx2265"></a>
<dd>Specifies a default value for the column. This clause cannot be specified
more than once in a <var class="pv">column-definition</var>. DEFAULT cannot be specified
an identity column (a column that is defined AS IDENTITY). The database manager generates
default values for identity columns. If a value is not specified following
the DEFAULT keyword, then:
<ul>
<li>if the column is nullable, the default value is the null value.</li>
<li>if the column is not nullable, the default depends on the data type of
the column:
<a name="wq1404"></a>
<table id="wq1404" width="90%" summary="" border="1" frame="border" rules="all">
<thead valign="bottom">
<tr>
<th id="wq1405" width="40%" align="left" valign="top">Data type</th>
<th id="wq1406" width="59%" align="left" valign="top">Default value</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td align="left" valign="top" headers="wq1405">Numeric</td>
<td align="left" valign="top" headers="wq1406">0</td>
</tr>
<tr>
<td align="left" valign="top" headers="wq1405">Fixed-length character or graphic string</td>
<td align="left" valign="top" headers="wq1406">Blanks</td>
</tr>
<tr>
<td align="left" valign="top" headers="wq1405">Fixed-length binary string</td>
<td align="left" valign="top" headers="wq1406">Hexadecimal zeros</td>
</tr>
<tr>
<td align="left" valign="top" headers="wq1405">Varying-length string</td>
<td align="left" valign="top" headers="wq1406">A string length of 0</td>
</tr>
<tr>
<td align="left" valign="top" headers="wq1405">Date</td>
<td align="left" valign="top" headers="wq1406">The current date at the time of INSERT</td>
</tr>
<tr>
<td align="left" valign="top" headers="wq1405">Time</td>
<td align="left" valign="top" headers="wq1406">The current time at the time of INSERT</td>
</tr>
<tr>
<td align="left" valign="top" headers="wq1405">Timestamp</td>
<td align="left" valign="top" headers="wq1406">The current timestamp at the time of INSERT</td>
</tr>
<tr>
<td align="left" valign="top" headers="wq1405">Datalink</td>
<td align="left" valign="top" headers="wq1406">A value corresponding to DLVALUE('','URL','')</td>
</tr>
<tr>
<td align="left" valign="top" headers="wq1405"><var class="pv">distinct-type</var></td>
<td align="left" valign="top" headers="wq1406">The default value of the corresponding source
type of the distinct type.</td>
</tr>
</tbody>
</table></li></ul>
<p>Omission of NOT NULL and DEFAULT from a <var class="pv">column-definition</var> is
an implicit specification of DEFAULT NULL. </p>
<dl class="parml">
<dt class="bold"><span class="italic">constant</span></dt>
<dd>Specifies the constant as the default for the column. The specified
constant must represent a value that could be assigned to the column in accordance
with the rules of assignment as described in <a href="rbafzmstch2bas.htm#ch2bas">Assignments and comparisons</a>.
A floating-point constant must not be used for a SMALLINT, INTEGER, DECIMAL,
or NUMERIC column. A decimal constant must not contain more digits to the
right of the decimal point than the specified scale of the column.
</dd>
<dt class="bold"><span class="bold">USER</span></dt>
<dd>Specifies the value of the USER special register at the time of INSERT
or UPDATE as the default value of the column. The data type of the column
must be CHAR or VARCHAR with a length attribute greater than or equal to the
length attribute of the USER special register.
</dd>
<dt class="bold"><span class="bold">NULL</span></dt>
<dd>Specifies null as the default for the column. If NOT NULL is specified,
DEFAULT NULL must not be specified within the same <var class="pv">column-definition</var>.
</dd>
<dt class="bold"><span class="bold">CURRENT_DATE</span> </dt><a id="idx2266" name="idx2266"></a>
<dd>Specifies the current date as the default for the column. If CURRENT_DATE
is specified, the data type of the column must be DATE or a distinct type
based on a DATE.
</dd>
<dt class="bold"><span class="bold">CURRENT_TIME</span> </dt><a id="idx2267" name="idx2267"></a>
<dd>Specifies the current time as the default for the column. If CURRENT_TIME
is specified, the data type of the column must be TIME or a distinct type
based on a TIME.
</dd>
<dt class="bold"><span class="bold">CURRENT_TIMESTAMP</span> <a id="idx2268" name="idx2268"></a></dt>
<dd>Specifies the current timestamp as the default for the column. If CURRENT_TIMESTAMP
is specified, the data type of the column must be TIMESTAMP or a distinct
type based on a TIMESTAMP.
</dd>
<dt class="bold"><var class="pv">cast-function-name</var> </dt><a id="idx2269" name="idx2269"></a>
<dd>This form of a default value can only be used with columns defined as
a distinct type, <span>BINARY, VARBINARY,</span> BLOB, CLOB, DBCLOB, DATE, TIME
or TIMESTAMP data types. The following table describes the allowed uses of
these <var class="pv">cast-functions</var>.
<a name="wq1407"></a>
<table id="wq1407" width="100%" summary="" border="1" frame="border" rules="none">
<thead valign="bottom">
<tr>
<th id="wq1408" width="47%" align="left" valign="top">Data Type</th>
<th id="wq1409" width="52%" align="left" valign="top">Cast Function Name</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td align="left" valign="top" headers="wq1408">Distinct type N based on a <span>BINARY, VARBINARY,</span> BLOB, CLOB, or DBCLOB</td>
<td align="left" valign="top" headers="wq1409"><span>BINARY, VARBINARY,</span> BLOB, CLOB, or
DBCLOB *</td>
</tr>
<tr>
<td align="left" valign="top" headers="wq1408">Distinct type N based on a DATE, TIME, or
TIMESTAMP</td>
<td align="left" valign="top" headers="wq1409">N (the user-defined cast function that was
generated when N was created) **
<div class="lines">or<br />
DATE, TIME, or TIMESTAMP *<br />
</div></td>
</tr>
<tr>
<td align="left" valign="top" headers="wq1408">Distinct type N based on other data types</td>
<td align="left" valign="top" headers="wq1409">N (the user-defined cast function that was
generated when N was created) **</td>
</tr>
<tr>
<td align="left" valign="top" headers="wq1408"><span>BINARY, VARBINARY,</span> BLOB, CLOB, or
DBCLOB</td>
<td align="left" valign="top" headers="wq1409"><span>BINARY, VARBINARY,</span> BLOB, CLOB, or
DBCLOB *</td>
</tr>
<tr>
<td align="left" valign="top" headers="wq1408">DATE, TIME, or TIMESTAMP</td>
<td align="left" valign="top" headers="wq1409">DATE, TIME, or TIMESTAMP *</td>
</tr>
<tr>
<td colspan="2" align="left" valign="top" headers="wq1408 wq1409">
<a name="wq1410"></a>
<div class="notetitle" id="wq1410">Notes:</div>
<div class="notebody">
<p>* The name of the function must
match the name of the data type (or the source type of the distinct type)
with an implicit or explicit schema name of QSYS2.</p>
<p>**
The name of the function must match the name of the distinct type for the
column. If qualified with a schema name, it must be the same as the schema
name for the distinct type. If not qualified, the schema name from function
resolution must be the same as the schema name for the distinct type.</p></div></td>
</tr>
</tbody>
</table>
<dl class="parml">
<dt class="bold"><var class="pv">constant</var> </dt><a id="idx2270" name="idx2270"></a>
<dd>Specifies a constant as the argument. The constant must conform to the
rules of a constant for the source type of the distinct type or for the data
type if not a distinct type. For <span>BINARY, VARBINARY,</span> BLOB, CLOB, DBCLOB,
DATE, TIME, and TIMESTAMP functions, the constant must be a string constant.
</dd>
<dt class="bold"><span class="bold">USER</span></dt><a id="idx2271" name="idx2271"></a>
<dd>Specifies the value of the USER special register at the time of INSERT
or UPDATE as the default value for the column. The data type of the source
type of the distinct type of the column must be CHAR or VARCHAR with a length
attribute greater than or equal to the length attribute of the USER special
register.
</dd>
<dt class="bold"><span class="bold">CURRENT_DATE</span> </dt><a id="idx2272" name="idx2272"></a>
<dd>Specifies the current date as the default for the column. If CURRENT_DATE
is specified, the data type of the source type of the distinct type of the
column must be DATE.
</dd>
<dt class="bold"><span class="bold">CURRENT_TIME</span> </dt><a id="idx2273" name="idx2273"></a>
<dd>Specifies the current time as the default for the column. If CURRENT_TIME
is specified, the data type of the source type of the distinct type of the
column must be TIME.
</dd>
<dt class="bold"><span class="bold">CURRENT_TIMESTAMP</span> </dt><a id="idx2274" name="idx2274"></a>
<dd>Specifies the current timestamp as the default for the column. If CURRENT_TIMESTAMP
is specified, the data type of the source type of the distinct type of the
column must be TIMESTAMP.
</dd>
</dl>
</dd>
</dl>
<p>If the value specified is not valid, an error is returned.</p>
</dd>
<dt class="bold"><span class="bold">GENERATED</span> </dt><a id="idx2275" name="idx2275"></a>
<dd>Specifies that the database manager generates values for the column. GENERATED may
be specified if the column is to be considered an identity column (defined
with the AS IDENTITY clause).
<dl class="parml">
<dt class="bold"><span class="bold">ALWAYS</span></dt>
<dd>Specifies that the database manager will always generate a value for the column when
a row is inserted into the table. ALWAYS is the recommended value.
</dd>
<dt class="bold"><span class="bold">BY DEFAULT</span></dt>
<dd>Specifies that the database manager will generate a value for the column when a row
is inserted only if a value is not specified for the column. If a value is
specified, the database manager uses that value.
<p>For an identity column, the database manager inserts
a specified value but does not verify that it is a unique value for the column
unless the identity column has a unique constraint or a unique index that
solely specifies the identity column.</p>
</dd>
</dl>
</dd>
<dt class="bold"><span class="bold">AS IDENTITY</span> </dt><a id="idx2276" name="idx2276"></a>
<dd>Specifies that the column is an identity column for the table. A table
can have only one identity column. AS IDENTITY can be specified only if the
data type for the column is an exact numeric type with a scale of zero (SMALLINT,
INTEGER, BIGINT, DECIMAL or NUMERIC with a scale of zero, or a distinct type
based on one of these data types). If a DECIMAL or NUMERIC data type is specified,
the precision must not be greater than 31.
<p>An identity column is implicitly
NOT NULL. See the AS IDENTITY clause in <a href="rbafzmsthctabl.htm#hctabl">CREATE TABLE</a> for the descriptions
of the identity attributes.</p>
</dd>
<dt class="bold"><var class="pv">datalink-options</var> </dt><a id="idx2277" name="idx2277"></a>
<dd>Specifies the options associated with a DATALINK data type.
<dl class="parml">
<dt class="bold">LINKTYPE URL</dt>
<dd>Defines the type of link as a Uniform Resource Locator (URL).
</dd>
<dt class="bold">NO LINK CONTROL</dt>
<dd>Specifies that there will not be any check made to determine that the
linked files exist. Only the syntax of the URL will be checked. There is no
database manager control over the linked files.
</dd>
</dl>
</dd>
</dl>
<a name="wq1411"></a>
<h3 id="wq1411"><a href="rbafzmst02.htm#ToC_983">LIKE</a></h3><a id="idx2278" name="idx2278"></a>
<dl class="parml">
<dt class="bold"><var class="pv">table-name</var> or <var class="pv">view-name</var> </dt>
<dd>Specifies that the columns defined in the specified table or view are
included in this table. The <var class="pv">table-name</var> or <var class="pv">view-name</var> specified
in a LIKE clause must identify the table or view that already exists at the application server.
<p>The use of LIKE is an implicit definition of n columns, where n is the number
of columns in the identified table or view. The implicit definition includes
the following attributes of the n columns (if applicable to the data type):</p>
<ul>
<li>Column name (and system column name)</li>
<li>Data type, length, precision, and scale</li>
<li>CCSID</li></ul>
<p>If the LIKE clause is specified immediately following the <var class="pv">table-name</var> and not enclosed in parenthesis, the following column attributes
are also included, otherwise they are not included (the default value and
identity attributes can also be controlled by using the <var class="pv">copy-options</var>):</p>
<ul>
<li>Default value, if a <var class="pv">table-name</var> is specified (<var class="pv">view-name</var> is
not specified)</li>
<li>Identity attributes</li>
<li>Nullability</li>
<li>Column heading and text (see <a href="rbafzmstlabelon.htm#labelon">LABEL</a>)</li></ul>
<p>If the specified table or view is a non-SQL created physical file
or logical file, any non-SQL attributes are removed. For example, the date
and time format will be changed to ISO.</p>
<p>The implicit definition does
not include any other optional attributes of the identified table or view.
For example, the new table does not automatically include a primary key or
foreign key from a table. The new table has these and other optional attributes
only if the optional clauses are explicitly specified.</p>
</dd>
</dl>
<a name="wq1412"></a>
<h3 id="wq1412"><a href="rbafzmst02.htm#ToC_984">as-subquery-clause</a></h3><a id="idx2279" name="idx2279"></a>
<dl class="parml">
<dt class="bold"><var class="pv">column-name</var> </dt>
<dd>Names a column of the table. Do not qualify <var class="pv">column-name</var> and
do not use the same name for more than one column of the table or for a system-column-name
of the table.
</dd>
<dt class="bold">FOR COLUMN <var class="pv">system-column-name</var> </dt>
<dd>Provides an i5/OS name for the column. Do not use the same name for
more than one column of the table or for a column-name of the table.
<p>If
the system-column-name is not specified, and the column-name is not a valid
system-column-name, a system column name is generated. For more information
about how system column names are generated, see <a href="rbafzmsthctabl.htm#cnamrul">Rules for Column Name Generation</a>.</p>
</dd>
<dt class="bold"><var class="pv">select-statement</var> </dt>
<dd>Specifies that the columns of the table are to have the same name and
description as the columns that would appear in the derived result table of
the <var class="pv">select-statement</var> if the <var class="pv">select-statement</var> were to be
executed. The use of AS <var class="pv">select-statement</var> is an implicit definition
of <var class="pv">n</var> columns for the table, where <var class="pv">n</var> is the number of columns
that would result from the <var class="pv">select-statement</var>. The implicit definition
includes the following attributes of the <var class="pv">n</var> columns (if applicable
to the data type):
<ul>
<li>Column name (and system column name)</li>
<li>Data type, length, precision, and scale</li>
<li>CCSID</li>
<li>Nullability</li>
<li>Column heading and text (see <a href="rbafzmstlabelon.htm#labelon">LABEL</a>)</li></ul>
<p>The following attributes are not included (the default value and identity
attributes may be included by using the <var class="pv">copy-options</var>):</p>
<ul>
<li>Default value</li>
<li>Identity attributes</li></ul>
<p>The implicit definition does not include any other optional attributes
of the tables or views referenced in the <var class="pv">select-statement</var>.</p>
<p>The implicitly defined columns of the table inherit the names of the columns
from the result table of the <var class="pv">select-statement</var>. Therefore, a column
name must be specified in the <var class="pv">select-statement</var> or in the column name
list for all result columns. For result columns that are derived from expressions,
constants, and functions, the <var class="pv">select-statement</var> must include the AS
column-name clause immediately after the result column or a name must be specified
in the column list preceding the <var class="pv">select-statement</var>.</p>
<p>The <var class="pv">select-statement</var> must not refer to variables or include parameter markers
(question marks). The <var class="pv">select-statement</var> must not contain a PREVIOUS
VALUE or a NEXT VALUE expression.</p>
</dd>
<dt class="bold">WITH DATA</dt>
<dd>Specifies that the <var class="pv">select-statement</var> is executed. After the
table is created, the result table rows of the <var class="pv">select-statement</var> are
automatically inserted into the table.
</dd>
<dt class="bold">WITH NO DATA</dt>
<dd>Specifies that the <var class="pv">select-statement</var> is not executed. Therefore,
there is no result table with a set of rows with which to automatically populate
the table.
</dd>
</dl>
<a name="wq1413"></a>
<h3 id="wq1413"><a href="rbafzmst02.htm#ToC_985">copy-options</a></h3><a id="idx2280" name="idx2280"></a><a id="idx2281" name="idx2281"></a><a id="idx2282" name="idx2282"></a>
<dl class="parml">
<dt class="bold">INCLUDING IDENTITY COLUMN ATTRIBUTES <span>or</span> EXCLUDING IDENTITY COLUMN ATTRIBUTES</dt>
<dd>Specifies whether identity column attributes are inherited.
<dl class="parml">
<dt class="bold">INCLUDING IDENTITY COLUMN ATTRIBUTES</dt>
<dd>Specifies that the table inherits the identity attribute, if any, of
the columns resulting from <var class="pv">select-statement</var>, <var class="pv">table-name</var>,
or <var class="pv">view-name</var>. In general, the identity attribute is copied if the
element of the corresponding column in the table, view, or <var class="pv">select-statement</var> is the name of a table column or the name of a view column that directly
or indirectly maps to the name of a base table column with the identity attribute.
If the INCLUDING IDENTITY COLUMN ATTRIBUTES clause is specified with the AS <var class="pv">select-statement</var> clause, the columns of the new table do not inherit
the identity attribute in the following cases:
<ul>
<li>The select list of the <var class="pv">select-statement</var> includes multiple instances
of an identity column name (that is, selecting the same column more than once).</li>
<li>The select list of the <var class="pv">select-statement</var> includes multiple identity
columns (that is, it involves a join).</li>
<li>The identity column is included in an expression in the select list.</li>
<li>The <var class="pv">select-statement</var> includes a set operation (UNION or INTERSECT).</li></ul>
<p>If INCLUDING IDENTITY is not specified, the table will not have an
identity column.</p>
</dd>
<dt class="bold">EXCLUDING IDENTITY COLUMN ATTRIBUTES</dt>
<dd>Specifies that the table does not inherit the identity attribute, if
any, of the columns resulting from the <var class="pv">fullselect</var>, <var class="pv">table-name</var>, or <var class="pv">view-name</var>.
</dd>
</dl>
</dd>
<dt class="bold">EXCLUDING COLUMN DEFAULTS <span>or</span> INCLUDING
COLUMN DEFAULTS <span>or</span> USING TYPE DEFAULTS</dt>
<dd>Specifies whether column defaults are inherited.
<dl class="parml">
<dt class="bold">EXCLUDING COLUMN DEFAULTS</dt>
<dd>Specifies that the column defaults are not inherited from the definition
of the source table. The default values of the column of the new table are
either null or there are no default values. If the column can be null, the
default is the null value. If the column cannot be null, there is no default
value, and an error occurs if a value is not provided for a column on INSERT
for the new table.
</dd>
<dt class="bold">INCLUDING COLUMN DEFAULTS</dt>
<dd>Specifies that the table inherits the default values of the columns
resulting from the <var class="pv">select-statement</var>, <var class="pv">table-name</var>, or <var class="pv">view-name</var>. A default value is the value assigned to a column when a value
is not specified on an INSERT.
<p>Do not specify INCLUDING COLUMN DEFAULTS,
if you specify USING TYPE DEFAULTS.</p>
<p>If INCLUDING COLUMN DEFAULTS is
not specified, the default values are not inherited.</p>
</dd>
<dt class="bold">USING TYPE DEFAULTS</dt>
<dd>Specifies that the default values for the table depend on the data type
of the columns that result from the <var class="pv">select-statement</var>, <var class="pv">table-name</var>, or <var class="pv">view-name</var>. If the column is nullable, then the default
value is the null value. Otherwise, the default value is as follows:
<a name="wq1414"></a>
<table id="wq1414" width="100%" summary="" border="1" frame="border" rules="all">
<thead valign="bottom">
<tr>
<th id="wq1415" width="40%" align="left" valign="top">Data type</th>
<th id="wq1416" width="59%" align="left" valign="top">Default value</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td align="left" valign="top" headers="wq1415">Numeric</td>
<td align="left" valign="top" headers="wq1416">0</td>
</tr>
<tr>
<td align="left" valign="top" headers="wq1415">Fixed-length character or graphic string</td>
<td align="left" valign="top" headers="wq1416">Blanks</td>
</tr>
<tr>
<td align="left" valign="top" headers="wq1415">Fixed-length binary string</td>
<td align="left" valign="top" headers="wq1416">Hexadecimal zeros</td>
</tr>
<tr>
<td align="left" valign="top" headers="wq1415">Varying-length string</td>
<td align="left" valign="top" headers="wq1416">A string length of 0</td>
</tr>
<tr>
<td align="left" valign="top" headers="wq1415">Date</td>
<td align="left" valign="top" headers="wq1416">The current date at the time of INSERT</td>
</tr>
<tr>
<td align="left" valign="top" headers="wq1415">Time</td>
<td align="left" valign="top" headers="wq1416">The current time at the time of INSERT</td>
</tr>
<tr>
<td align="left" valign="top" headers="wq1415">Timestamp</td>
<td align="left" valign="top" headers="wq1416">The current timestamp at the time of INSERT</td>
</tr>
<tr>
<td align="left" valign="top" headers="wq1415">Datalink</td>
<td align="left" valign="top" headers="wq1416">A value corresponding to DLVALUE('','URL','')</td>
</tr>
<tr>
<td align="left" valign="top" headers="wq1415"><var class="pv">distinct-type</var></td>
<td align="left" valign="top" headers="wq1416">The default value of the corresponding source
type of the distinct type.</td>
</tr>
</tbody>
</table>
<p>Do not specify USING TYPE DEFAULTS if INCLUDING COLUMN
DEFAULTS is specified.</p>
</dd>
</dl>
</dd>
</dl>
<dl class="parml">
<dt class="bold">WITH REPLACE</dt><a id="idx2283" name="idx2283"></a>
<dd>Specifies that, in the case that a declared global temporary table already
exists with the specified name, the existing table is replaced with the temporary
table defined by this statement (and all rows of the existing table are deleted).
<p>When WITH REPLACE is not specified, then the name specified must not identify
a declared global temporary table that already exists in the current session.</p>
</dd>
<dt class="bold">ON COMMIT</dt><a id="idx2284" name="idx2284"></a>
<dd>Specifies the action taken on the global temporary table when a COMMIT
operation is performed.
<p>The ON COMMIT clause does not apply if the declared
global temporary table is opened under isolation level No Commit (NC) or if
a COMMIT HOLD operation is performed.</p>
<dl class="parml">
<dt class="bold">DELETE ROWS</dt>
<dd>All rows of the table will be deleted if no WITH HOLD cursor is open
on the table. This is the default.
</dd>
<dt class="bold">PRESERVE ROWS</dt>
<dd>Rows of the table will be preserved.
</dd>
</dl>
</dd>
<dt class="bold">NOT LOGGED</dt><a id="idx2285" name="idx2285"></a>
<dd>Changes to the table are not logged, including creation of the table.
When a ROLLBACK (or ROLLBACK TO SAVEPOINT) operation is performed and the
table was changed in the unit of work (or savepoint), the changes are not
rolled back. If the table was created in the unit of work (or savepoint),
then that table will be dropped. If the table was dropped in the unit of work
(or savepoint) then the table will be restored, but with no rows.
<dl class="parml">
<dt class="bold">ON ROLLBACK</dt><a id="idx2286" name="idx2286"></a>
<dd>Specifies the action taken on the global temporary table when a ROLLBACK
operation is performed.
<p> The ON ROLLBACK clause does not apply if the declared
global temporary table was opened under isolation level No Commit (NC) or
if a ROLLBACK HOLD operation is performed.</p>
<dl class="parml">
<dt class="bold">DELETE ROWS</dt>
<dd>All rows of the table will be deleted. This is the default.
</dd>
<dt class="bold">PRESERVE ROWS</dt>
<dd>Rows of the table will be preserved.
</dd>
</dl>
</dd>
</dl>
</dd>
</dl>
<a name="wq1417"></a>
<h3 id="wq1417"><a href="rbafzmst02.htm#ToC_986">Notes</a></h3>
<p><span class="bold">Instantiation, scope, and termination:</span> Let P denote
an application process and let T be a declared temporary table in an application
program in P:</p>
<ul>
<li>When a program in P issues a DECLARE GLOBAL TEMPORARY TABLE statement,
an empty instance of T is created.</li>
<li>Any program in P can reference T, and any of those references is a reference
to that same instance of T. (If a DECLARE GLOBAL TEMPORARY statement is specified
within a compound statement of an SQL function, SQL procedure, or trigger;
the scope of the declared temporary table is the application process and not
the compound statement.)
<p>If T was declared at a remote server, the reference
to T must use the same connection that was used to declare T and that connection
must not have been terminated after T was declared. When the connection to
the database server at which T was declared terminates, T is dropped.</p></li>
<li>If T is defined with the ON COMMIT DELETE ROWS clause, when a commit operation
terminates a unit of work in P and no program in P has a WITH HOLD cursor
open that is dependent on T, all rows are deleted.</li>
<li>If T is defined with the ON ROLLBACK DELETE ROWS clause, when a rollback
operation terminates a unit of work in P, all rows are deleted.</li>
<li>When the application process that declared T terminates, T is dropped.</li></ul>
<p><span class="bold">Temporary table ownership:</span> The <span class="italic">owner</span> of the table is the user profile of the job executing the statement.</p>
<p><span class="bold">Temporary table authority:</span> When a declared temporary
table is defined, PUBLIC implicitly is granted all table privileges on the
table and authority to drop the table.</p>
<p><span class="bold">Referring to a declared temporary table in other SQL statements:</span> Many SQL statements support declared temporary tables. To refer to a
declared temporary table in an SQL statement other than DECLARE GLOBAL TEMPORARY
TABLE, the table must be implicitly or explicitly qualified with SESSION.</p>
<p>If you use SESSION as the qualifier for a table name but the application
process does not include a DECLARE GLOBAL TEMPORARY TABLE statement for the
table name, the database manager assumes that you are not referring to a declared temporary
table. The database manager resolves such table references to a permanent table.</p>
<p><span class="bold">Restrictions on the use of declared temporary tables:</span> </p>
<ul>
<li>Declared temporary tables cannot be specified in an ALTER TABLE,
COMMENT, GRANT, LABEL, LOCK, RENAME, or REVOKE statement.</li>
<li>Declared temporary tables cannot be specified as the parent table in referential
constraints</li>
<li>If a declared temporary table is referenced in a CREATE INDEX or CREATE
VIEW statement, the index or view must be created in SESSION (or library QTEMP).</li></ul>
<p><span class="bold">Syntax alternatives:</span> The following keywords are synonyms
supported for compatibility to prior releases. These keywords are non-standard
and should not be used:</p>
<ul>
<li>DEFINITION ONLY is a synonym for WITH NO DATA</li></ul>
<a name="wq1418"></a>
<h3 id="wq1418"><a href="rbafzmst02.htm#ToC_987">Examples</a></h3>
<p><span class="italic">Example 1:</span> Define a declared temporary table with
column definitions for an employee number, salary, commission, and bonus. </p>
<pre class="xmp"> <span class="bold">DECLARE GLOBAL TEMPORARY TABLE</span> SESSION.TEMP_EMP
<span class="bold">(</span>EMPNO <span class="bold">CHAR(</span>6<span class="bold">) NOT NULL</span>,
SALARY <span class="bold">DECIMAL(</span>9, 2<span class="bold">)</span>,
BONUS <span class="bold">DECIMAL(</span>9, 2<span class="bold">)</span>,
COMM <span class="bold">DECIMAL(</span>9, 2<span class="bold">))</span>
<span class="bold">ON COMMIT PRESERVE ROWS</span></pre>
<p><span class="italic">Example 2:</span> Assume that base table USER1.EMPTAB
exists and that it contains three columns, one of which is an identity column.
Declare a temporary table that has the same column names and attributes (including
identity attributes) as the base table.</p>
<pre class="xmp"> <span class="bold">DECLARE GLOBAL TEMPORARY TABLE</span> TEMPTAB1
<span class="bold">LIKE</span> USER1.EMPTAB
<span class="bold">INCLUDING IDENTITY</span>
<span class="bold">ON COMMIT PRESERVE ROWS</span></pre><p class="indatacontent">In the above example, the database manager uses
SESSION as the implicit qualifier for TEMPTAB1.</p><a id="idx2287" name="idx2287"></a><a id="idx2288" name="idx2288"></a>
<hr /><br />
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