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<meta name="doctitle" content="About PL/SQL Identifiers" />
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<title>About PL/SQL Identifiers</title>
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<h1>About PL/SQL Identifiers</h1>
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<p><a id="sthref322" name="sthref322"></a><a id="sthref323" name="sthref323"></a>Every PL/SQL subprogram, package, parameter, variable, constant, exception, and explicit cursor has a name, which is a PL/SQL identifier.</p>
<p>The minimum length of an identifier is one character; the maximum length is 30 characters. The first character must be a letter, but each later character can be either a letter, numeral, dollar sign ($), underscore (_), or number sign (#). For example, these are acceptable identifiers:</p>
<pre xml:space="preserve" class="oac_no_warn">
X
t2
phone#
credit_limit
LastName
oracle$number
money$$$tree
SN##
try_again_
</pre>
<p><a id="sthref324" name="sthref324"></a>PL/SQL is not case-sensitive for identifiers. For example, PL/SQL considers these to be the same:</p>
<pre xml:space="preserve" class="oac_no_warn">
lastname
LastName
LASTNAME
</pre>
<p>You cannot use a PL/SQL reserved word as an identifier. You can use a PL/SQL keyword as an identifier, but it is not recommended. For lists of PL/SQL reserved words and keywords, see <a href="javascript:open('http://www.oracle.com/pls/db112/lookup?id=LNPLS019','newWindow').focus()"><span class="italic">Oracle Database PL/SQL Language Reference</span></a>.</p>
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<p class="notep1">Tip:</p>
Use meaningful names for identifiers, and follow a <a id="sthref325" name="sthref325"></a>naming convention. For example, start each constant name with <code>con_</code>, each variable name with <code>var_</code>, and so on.</td>
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<h2>Related Topics</h2>
<p><a href="javascript:open('http://www.oracle.com/pls/db112/lookup?id=LNPLS99973','newWindow').focus()"><span class="italic">Oracle Database PL/SQL Language Reference</span></a> for additional general information about PL/SQL identifiers</p>
<p><a href="javascript:open('http://www.oracle.com/pls/db112/lookup?id=LNPLS00203','newWindow').focus()"><span class="italic">Oracle Database PL/SQL Language Reference</span></a> for additional information about PL/SQL naming conventions</p>
<p><a href="javascript:open('http://www.oracle.com/pls/db112/lookup?id=LNPLS00204','newWindow').focus()"><span class="italic">Oracle Database PL/SQL Language Reference</span></a> for information about the scope and visibility of PL/SQL identifiers</p>
<p><a href="javascript:open('http://www.oracle.com/pls/db112/lookup?id=LNPLS01213','newWindow').focus()"><span class="italic">Oracle Database PL/SQL Language Reference</span></a> for information how to collect data on PL/SQL identifiers</p>
<p><a href="javascript:open('http://www.oracle.com/pls/db112/lookup?id=LNPLS017','newWindow').focus()"><span class="italic">Oracle Database PL/SQL Language Reference</span></a> for information about how PL/SQL resolves identifier names</p>
<p><a href="tdddg_subprograms.htm#CIHDFDJG">Developing Stored Subprograms and Packages</a></p>
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