77 lines
4.3 KiB
HTML
77 lines
4.3 KiB
HTML
<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" 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="dc.language" scheme="rfc1766" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<meta name="dc.date" scheme="iso8601" content="2005-09-19" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow"/>
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="keywords" content="SQL, comment" />
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<title>SQL comments</title>
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<link rel="stylesheet" type="text/css" href="ibmidwb.css" />
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<link rel="stylesheet" type="text/css" href="ic.css" />
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</head>
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<body>
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<a id="Top_Of_Page" name="Top_Of_Page"></a><!-- Java sync-link -->
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<script language = "Javascript" src = "../rzahg/synch.js" type="text/javascript"></script>
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<a name="sqcomm"></a>
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<h2 id="sqcomm"><a href="rbafzmst02.htm#ToC_733">SQL comments</a></h2><a id="idx1273" name="idx1273"></a>
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<p>Static SQL statements can include host language or SQL comments. Dynamic
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SQL statements can include SQL comments. There are two types of SQL comments:</p>
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<dl>
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<dt class="bold">simple comments</dt>
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<dd>Simple comments are introduced by two consecutive hyphens.
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</dd>
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<dt class="bold">bracketed comments</dt>
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<dd>Bracketed comments are introduced by /* and end with */.
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</dd>
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</dl>
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<p>These rules apply to the use of simple comments: </p>
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<ul>
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<li>The two hyphens must be on the same line and must not be separated by
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a space.</li>
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<li>Simple comments can be started wherever a space is valid (except within
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a delimiter token or between 'EXEC' and 'SQL').</li>
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<li>Simple comments cannot be continued to the next line.</li>
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<li>In COBOL, the hyphens must be preceded by a space.</li></ul>
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<p>These rules apply to the use of bracketed comments: </p>
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<ul>
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<li>The /* must be on the same line and not separated by a space.</li>
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<li>The */ must be on the same line and not separated by a space.</li>
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<li>Bracketed comments can be started wherever a space is valid (except within
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a delimiter token or between 'EXEC' and 'SQL').</li>
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<li>Bracketed comments can be continued to the next line.</li>
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<li>Bracketed comments can be nested within other bracketed comments.</li></ul>
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<p><span class="italic">Example 1</span>: This example shows how to include simple
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comments in a statement: </p>
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<pre class="xmp"> <span class="bold">CREATE VIEW</span> PRJ_MAXPER -- PROJECTS WITH MOST SUPPORT PERSONNEL
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<span class="bold">AS SELECT</span> PROJNO, PROJNAME -- NUMBER AND NAME OF PROJECT
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<span class="bold">FROM</span> PROJECT
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<span class="bold">WHERE</span> DEPTNO = 'E21' -- SYSTEMS SUPPORT DEPT CODE
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<span class="bold">AND</span> PRSTAFF > 1</pre>
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<p><span class="italic">Example 2</span>: This example shows how to include bracketed
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comments in a statement: </p>
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<pre class="xmp"> <span class="bold">CREATE VIEW</span> PRJ_MAXPER /* PROJECTS WITH MOST SUPPORT
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PERSONNEL */
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<span class="bold">AS SELECT</span> PROJNO, PROJNAME /* NUMBER AND NAME OF PROJECT */
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<span class="bold">FROM</span> PROJECT
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<span class="bold">WHERE</span> DEPTNO = 'E21' /* SYSTEMS SUPPORT DEPT CODE */
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<span class="bold">AND</span> PRSTAFF > 1</pre>
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<hr /><br />
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