126 lines
8.0 KiB
HTML
126 lines
8.0 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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<meta name="DC.Title" content="Create a table and define a column" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Create a table and define a column</title>
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</head>
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<body id="rzatccrttable"><a name="rzatccrttable"><!-- --></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 a table and define a column</h1>
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<div><div class="section">A table is a basic database object that is used to store information.
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After you have created a table, you can define columns, create indexes, and
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add triggers and constraints by using the Table Properties window. <p>When
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you are creating a table, you need to understand the concepts of null value
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and default value. A null value indicates the absence of a column value for
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a row. It is not the same as a value of zero or all blanks. It means <em>unknown</em>.
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It is not equal to any value, not even to other null values. If a column does
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not allow the null value, a value must be assigned to the column. This value
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is either a default value or a user supplied value.</p>
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<p>If no value is specified
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for a column when a row is added to a table, the row is assigned a default
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value. If the column is not assigned a specific default value, the column
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uses the system default value.</p>
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<p>This example shows you how to create
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a table to maintain information about the current inventory of a business.
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It has information about the items kept in the inventory, their cost, quantity
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currently on hand, the last order date, and the number last ordered. The item
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number is a required value. It cannot be null. The item name, quantity on
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hand, and order quantity have user-supplied default values. The last order
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date and quantity allow the null value.</p>
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<p>To create a table, follow these
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steps:</p>
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</div>
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<ol><li><span>In the <span class="keyword">iSeries™ Navigator</span> window,
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expand the system that you want to use. </span></li>
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<li><span>Expand <span class="uicontrol">Databases</span> and the database that you
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want to work with.</span></li>
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<li><span>Expand <span class="uicontrol">Schemas</span>.</span></li>
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<li><span>Right-click <span class="uicontrol">SAMPLELIB</span> and select <span class="uicontrol">New</span>.</span></li>
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<li><span>Select <span class="menucascade"><span class="uicontrol">Table</span> > <span class="uicontrol">Table</span></span>.</span></li>
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<li><span>On the New Table window, specify INVENTORY_LIST as the table name.</span></li>
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<li><span>Select <span class="uicontrol">SAMPLELIB</span> in the <span class="uicontrol">Schema</span> field.</span></li>
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<li><span>Select <span class="uicontrol">System-generated</span> in the <span class="uicontrol">System
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table name</span> field.</span></li>
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<li><span>Specify a description in the <span class="uicontrol">Text</span> field
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(optional). <br /><img src="rzatc002.gif" alt="screen capture of new table window" /><br /></span></li>
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<li><span>Next, define a column for the new table. Click the <span class="uicontrol">Columns</span> tab.</span></li>
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<li><span>Click the <span class="uicontrol">Add</span> button.</span></li>
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<li><span>Enter ITEM_NUMBER in the <span class="uicontrol">Column name</span> field.</span></li>
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<li><span>You can specify a short name in the <span class="uicontrol">Short column name</span> field.
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If you do not specify a short name, the system automatically generates a name.
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If the column name is 10 characters or less, then the short name is the same
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as the column name. You can perform queries by using either column name. Just
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leave this space as the default, <span class="uicontrol">System-generated</span>,
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for now.</span></li>
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<li><span>Select <span class="uicontrol">CHARACTER</span> as the Data type.</span></li>
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<li><span>Specify a length of 6 for this column. For data types where the
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size is predetermined, the size is filled in and you cannot change the value.</span></li>
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<li><span>Leave the <span class="uicontrol">Encoding</span> option as the default, <span class="uicontrol">Data
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type default</span>.</span></li>
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<li><span>You can specify a description for the column in the <span class="uicontrol">Text</span> field.
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This step is optional.</span></li>
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<li><span>Enter a column heading in the <span class="uicontrol">Heading</span> fields.
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The heading is the label that appears at the top of the column
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for displaying or printing. You are limited to 60 characters, 20 per line.</span></li>
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<li><span>Deselect the <span class="uicontrol">Nullable</span> option. This ensures
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that a value must be placed in this column in order for the row insert to
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be successful.</span></li>
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<li><span>In the <span class="uicontrol">Default value</span> field, enter <kbd class="userinput">0</kbd>. </span></li>
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<li><span>Click <span class="uicontrol">OK</span> to create the table.<br /><img src="rzatc003.gif" alt="screen capture of new column window" /><br /></span></li>
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</ol>
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<div class="section"><p>The new table INVENTORY_LIST appears. </p>
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</div>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rzatcdefinecol.htm">Define additional columns on a table</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzatcsupplier.htm">Create the supplier table (SUPPLIERS)</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzatccopycol.htm">Copy column definitions</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzatcinsertinfo.htm">Insert information into a table</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzatcviewcontents.htm">View the contents of a table</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzatcchangeinfo.htm">Change information in a table</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzatcdelinfo.htm">Delete information from a table</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzatccopytable.htm">Copy and move a table</a></strong><br />
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</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzatcgetstartinav.htm" title="This tutorial describes how to create and work with schemas, tables, and views using iSeries Navigator.">Get started with iSeries Navigator</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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