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9.2 KiB
HTML
151 lines
9.2 KiB
HTML
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<meta name="DC.Title" content="Create and use a table" />
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<title>Create and use a table</title>
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</head>
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<body id="rzatccrttblsql"><a name="rzatccrttblsql"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Create and use a table</h1>
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<div><div class="section">You can create a table by using the SQL CREATE TABLE statement. The
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CREATE TABLE statement allows you to create a table, define the physical attributes
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of the columns in the table, and define constraints to restrict the values
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that are allowed in the table.<p>When creating a table, you need to understand
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the concepts of null value and default value. A null value indicates the absence
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of a column value for a row. It is not the same as a value of zero or all
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blanks. It means "unknown." It is not equal to any value, not even to other
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null values. If a column does not allow the null value, a value must be assigned
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to the column, either a default value or a user supplied value.</p>
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<p>A default
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value is assigned to a column when a row is added to a table and no value
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is specified for that column. If a specific default value was not defined
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for a column, the system default value is used. For more information about
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the default values used by INSERT, see the <a href="../db2/rbafzmstbackup.htm">SQL
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Reference</a>.</p>
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<p>You are going to create a table to maintain information
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about the current inventory of a business. The table have information about
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the items kept in the inventory, their cost, quantity currently on hand, the
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last order date, and the number last ordered. The item number is a required
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value. It cannot be null. The item name, quantity on hand, and order quantity
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have user supplied default values. The last order date and quantity ordered
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allow the null value.</p>
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<p>You also create a second table. This table contain
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information about suppliers of your inventory items, which items they supply,
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and the cost of the item from that supplier.</p>
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</div>
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<ol><li class="stepexpand"><span>Create the first table named INVENTORY_LIST:</span><ol type="a"><li class="substepexpand"><span>On the Enter SQL Statements display, type <tt>CREATE TABLE</tt> and
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press F4 (Prompt). The following display is shown (with the input areas not
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yet filled in):</span> <div class="p"><pre class="screen"> Specify CREATE TABLE Statement
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Type information, press Enter.
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Table . . . . . . . . . <strong>INVENTORY_LIST</strong>______ Name
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Collection . . . . . . <strong>SAMPLECOLL</strong>__ Name, F4 for list
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Nulls: 1=NULL, 2=NOT NULL, 3=NOT NULL WITH DEFAULT
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Column FOR Column Type Length Scale Nulls
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<strong>ITEM_NUMBER</strong>_______ ____________ <strong>CHAR</strong>___________ <strong>6</strong>____ __ <strong>2</strong>
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<strong>ITEM_NAME</strong>_________ ____________ <strong>VARCHAR</strong>________ <strong>20</strong>___ __ <strong>3</strong>
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<strong>UNIT_COST</strong>_________ ____________ <strong>DECIMAL</strong>________ <strong>8</strong>____ <strong>2</strong>_ <strong>3</strong>
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<strong>QUANTITY_ON_HAND</strong>__ ____________ <strong>SMALLINT</strong>_______ _____ __ <strong>1</strong>
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<strong>LAST_ORDER_DATE</strong>___ ____________ <strong>DATE</strong>___________ _____ __ <strong>1</strong>
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<strong>ORDER_QUANTITY</strong>____ ____________ <strong>SMALLINT</strong>_______ _____ __ <strong>1</strong>
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__________________ ____________ _______________ _____ __ <strong>3</strong>
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Bottom
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Table CONSTRAINT . . . . . . . . . . . . . <strong>N</strong> Y=Yes, N=No
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Distributed Table . . . . . . . . . . . . <strong>N</strong> Y=Yes, N=No
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F3=Exit F4=Prompt F5=Refresh F6=Insert line F10=Copy line
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F11=Display more attributes F12=Cancel F14=Delete line F24=More keys</pre>
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</div>
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</li>
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<li class="substepexpand"><span>Type the table name INVENTORY_LIST and schema name SAMPLECOLL
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at the <span class="uicontrol">Table</span> and <span class="uicontrol">Collection</span> prompts,
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as shown.</span></li>
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<li class="substepexpand"><span>Each column you want to define for the table is represented
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by an entry in the list on the lower part of the display. For each column,
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type the name of the column, the data type of the column, its length and scale,
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and the null attribute.</span></li>
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<li class="substepexpand"><span>Press F11 to see more attributes that can be specified for the
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columns. This is where a default value can be specified. </span> <div class="p"><pre class="screen"> Specify CREATE TABLE Statement
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Type information, press Enter.
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Table . . . . . . . . . INVENTORY_LIST______ Name
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Collection . . . . . . SAMPLECOLL__ Name, F4 for list
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Data: 1=BIT, 2=SBCS, 3=MIXED, 4=CCSID
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Column Data Allocate CCSID CONSTRAINT Default
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ITEM NUMBER_______ _ _____ _____ N __________________
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ITEM NAME_________ _ _____ _____ N <span>'***UNKNOWN***'</span>___
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UNIT_COST_________ _ _____ _____ N __________________
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QUANTITY_ON_HAND__ _ _____ _____ N <span>NULL</span>______________
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LAST_ORDER_DATE___ _ _____ _____ N __________________
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ORDER_QUANTITY____ _ _____ _____ N <span>20</span>________________
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__________________ _ _____ _____ _ __________________
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Bottom
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Table CONSTRAINT . . . . . . . . . . . . . N Y=Yes, N=No
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Distributed Table . . . . . . . . . . . . N Y=Yes, N=No
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F3=Exit F4=Prompt F5=Refresh F6=Insert line F10=Copy line
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F11=Display more attributes F12=Cancel F14=Delete line F24=More keys</pre>
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</div>
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<div class="note"><span class="notetitle">Note:</span> Another way of entering column definitions is to press
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F4 (Prompt) with your cursor on one of the column entries in the list. A display
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that shows all of the attributes for defining a single column appears.</div>
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</li>
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<li class="substepexpand"><span>When all the values have been entered, press Enter to create
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the table. The Enter SQL Statements display is shown again with
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a message indicating that the table has been created.</span></li>
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</ol>
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<div class="note"><span class="notetitle">Note:</span> You can type this CREATE TABLE statement on the Enter SQL Statements
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display as follows: <pre><strong>CREATE TABLE</strong> SAMPLECOLL.INVENTORY_LIST
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(ITEM_NUMBER <strong>CHAR</strong>(6) <strong>NOT NULL,</strong>
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ITEM_NAME <strong>VARCHAR</strong>(20) <strong>NOT NULL WITH DEFAULT</strong> ’***UNKNOWN***’,
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UNIT_COST <strong>DECIMAL</strong>(8,2) <strong>NOT NULL WITH DEFAULT,</strong>
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QUANTITY_ON_HAND <strong>SMALLINT DEFAULT NULL,</strong>
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LAST_ORDER_DATE <strong>DATE,</strong>
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ORDER_QUANTITY <strong>SMALLINT DEFAULT</strong> 20)</pre>
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</div>
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</li>
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<li class="stepexpand"><span>Create a second table named SUPPLIERS. There are two methods you
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can use:</span><ol type="a"><li><span>Type the following command directly on the Enter SQL Statements
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display.</span></li>
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<li><span>Press F4 (Prompt) to use the interactive SQL displays to create
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the definition.</span></li>
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</ol>
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<pre><strong>CREATE TABLE</strong> SAMPLECOLL.SUPPLIERS
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(SUPPLIER_NUMBER <strong>CHAR</strong>(4)<strong>NOT NULL,</strong>
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ITEM_NUMBER <strong>CHAR</strong>(6) <strong>NOT NULL,</strong>
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SUPPLIER_COST <strong>DECIMAL</strong>(8,2))</pre>
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</li>
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</ol>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzatcgetstartsql.htm" title="This topic describes how to create and work with schemas, tables, and views using SQL statements in interactive SQL.">Get started with SQL</a></div>
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</div>
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</div>
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</body>
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</html>
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