117 lines
7.0 KiB
HTML
117 lines
7.0 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2005" />
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<meta name="DC.Title" content="Create a view combining data from multiple tables" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Create a view combining data from multiple tables</title>
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</head>
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<body id="rzatcmulttables"><a name="rzatcmulttables"><!-- --></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 view combining data from multiple tables</h1>
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<div><div class="section">You can create a view combining information from more than one table
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by selecting more than one table in the work area of the New View window.
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You can create a simple view from more than one table by selecting the columns
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that you want to include from different tables and clicking <strong>OK</strong>. However,
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this example shows how to create a view that joins information from two different
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tables and returns only those rows that you want to see, much like using a
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WHERE clause. <p>In this example, you create a view that contains only those
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item numbers for suppliers that can supply an item at lower cost than the
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current unit cost. This requires selecting ITEM_NUMBER and UNIT_COST
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from the INVENTORY_LIST table and joining them with SUPPLIER_NUMBER and SUPPLIER_COST
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from the SUPPLIERS table. A WHERE clause is used to limit the number of rows
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returned.</p>
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</div>
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<div class="p"><span>To create a view called LOWER_COST:</span><ol type="a"><li><span>Navigate to schema LIBRARY1. Right-click <span class="uicontrol">Views</span> and
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select <span class="uicontrol">New</span>.</span></li>
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<li><span>Select INVENTORY_LIST from SAMPLELIB and SUPPLIERS from LIBRARY1. </span></li>
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<li><span>Click <span class="uicontrol">OK</span>. Both tables should appear in
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the working area of the window.</span></li>
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<li><span>Select ITEM_NUMBER and UNIT_COST from INVENTORY_LIST.</span></li>
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<li><span>Select SUPPLIER_NUMBER and SUPPLIER_COST from SUPPLIERS.</span></li>
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<li><span>To define the join, select ITEM_NUMBER from INVENTORY_LIST and
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drag it to ITEM_NUMBER in SUPPLIERS. A line is drawn from one column to the
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other and the Join window opens.</span></li>
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<li><span>On the Join window, select <span class="uicontrol">Return rows with a matching
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condition (Inner Join)</span>.</span></li>
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<li><span>Click <span class="uicontrol">OK</span>.</span></li>
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<li><span>Click <span class="uicontrol">Select Rows</span> to create a WHERE clause
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for the view. Double-click LIBRARY1.SUPPLIERS.SUPPLIER_COST, then double-click
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the <span class="uicontrol"><</span> operator and finally double-click SAMPLELIB.INVENTORY_LIST.UNIT_COST
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. As you click the items, they appear in the window. You can also type this
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in directly.</span></li>
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<li><span>Click <span class="uicontrol">OK</span> to create the view, LOWER_COST.</span></li>
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</ol>
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<p><br /><img src="rzatc007.gif" alt="screen capture of new library window" /><br /></p>
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</div>
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<div class="section"><div class="note"><span class="notetitle">Note:</span> You can view the SQL used to create this view by selecting <span class="uicontrol">Show
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SQL</span>. You can also edit the SQL by selecting <span class="uicontrol">Edit SQL</span>.
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Edit SQL starts Run SQL Scripts, where you can edit your SQL statement. Be
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aware, however, that if you change the SQL, you will need to run the statement
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from Run SQL Scripts rather than returning to the New View window. If you
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return to the New View window, your changes are not saved.</div>
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<p>To display
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the contents of this new view, right-click LOWER_COST and select <span class="uicontrol">View
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Contents</span>. The rows that you see through this view are only those
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rows that have a supplier cost that is less than the unit cost.</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="border" border="1" rules="all"><thead align="left"><tr><th valign="top" width="27.247956403269757%" id="d0e98">ITEM_NUMBER </th>
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<th valign="top" width="20.435967302452315%" id="d0e100">UNIT_COST </th>
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<th valign="top" width="27.79291553133515%" id="d0e102">SUPPLIER_NUMBER </th>
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<th valign="top" width="24.52316076294278%" id="d0e104">SUPPLIER_COST</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" width="27.247956403269757%" headers="d0e98 ">153047 </td>
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<td valign="top" width="20.435967302452315%" headers="d0e100 ">10.00</td>
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<td valign="top" width="27.79291553133515%" headers="d0e102 ">9988 </td>
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<td valign="top" width="24.52316076294278%" headers="d0e104 ">8.00</td>
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</tr>
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<tr><td valign="top" width="27.247956403269757%" headers="d0e98 ">153047</td>
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<td valign="top" width="20.435967302452315%" headers="d0e100 ">10.00</td>
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<td valign="top" width="27.79291553133515%" headers="d0e102 ">2424 </td>
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<td valign="top" width="24.52316076294278%" headers="d0e104 ">9.00</td>
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</tr>
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<tr><td valign="top" width="27.247956403269757%" headers="d0e98 ">229740</td>
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<td valign="top" width="20.435967302452315%" headers="d0e100 ">1.50</td>
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<td valign="top" width="27.79291553133515%" headers="d0e102 ">1234 </td>
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<td valign="top" width="24.52316076294278%" headers="d0e104 ">1.00</td>
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</tr>
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<tr><td valign="top" width="27.247956403269757%" headers="d0e98 ">303476</td>
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<td valign="top" width="20.435967302452315%" headers="d0e100 ">2.00</td>
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<td valign="top" width="27.79291553133515%" headers="d0e102 ">3366 </td>
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<td valign="top" width="24.52316076294278%" headers="d0e104 ">1.50 </td>
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</tr>
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<tr><td valign="top" width="27.247956403269757%" headers="d0e98 ">073956 </td>
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<td valign="top" width="20.435967302452315%" headers="d0e100 ">20.00</td>
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<td valign="top" width="27.79291553133515%" headers="d0e102 ">3366</td>
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<td valign="top" width="24.52316076294278%" headers="d0e104 ">17.00</td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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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="rzatcview.htm">Create and use a view</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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