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<title>Tutorial: Creating a Sequence</title>
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<p><a id="BABJIDEG" name="BABJIDEG"></a><a id="TDDDG34100" name="TDDDG34100"></a></p>
<div class="sect2">
<h1>Tutorial: Creating a Sequence</h1>
<a name="BEGIN" id="BEGIN"></a>
<p><a id="sthref288" name="sthref288"></a>To create a sequence, use either the SQL&nbsp;Developer tool <a id="sthref289" name="sthref289"></a>Create Sequence or the DDL statement <a id="sthref290" name="sthref290"></a><code>CREATE</code> <code>SEQUENCE</code>.</p>
<p>This tutorial shows how to use the Create Database Sequence tool to create a sequence to use to generate primary keys for the <a id="sthref291" name="sthref291"></a><code>EVALUATIONS</code> table (created in <a href="tdddg_objects007.htm#BABEECGC">"Creating Tables with the CREATE TABLE Statement"</a>). The equivalent DDL statement is:</p>
<pre xml:space="preserve" class="oac_no_warn">
CREATE SEQUENCE <a id="sthref292" name="sthref292"></a>EVALUATIONS_SEQ
INCREMENT BY 1
START WITH 1 ORDER;
</pre>
<p>This sequence is part of the <a id="sthref293" name="sthref293"></a>sample application that the tutorials and examples in this document show how to develop and deploy.</p>
<a id="TDDDG211" name="TDDDG211"></a>
<p class="subhead2">To create EVALUATIONS_SEQ using the Create Database Sequence tool:</p>
<ol>
<li>
<p>On the Connections tab, expand <span class="bold">hr_conn</span>.</p>
<p>Under the <code>hr_conn</code> icon, a list of schema object types appears.</p>
</li>
<li>
<p>Right-click <span class="bold">Sequences</span>.</p>
<p>A list of choices appears.</p>
</li>
<li>
<p>Click <span class="bold">New Sequence</span>.</p>
<p>The Create Database Sequence window opens. The field Schema has the value <code>HR</code>, and the field Name has the default value, <code>SEQUENCE1</code>.</p>
</li>
<li>
<p>In the Name field, type <code>EVALUATIONS_SEQ</code> over the default value.</p>
</li>
<li>
<p>Click the tab <span class="bold">Properties</span>.</p>
<p>The Properties pane appears.</p>
</li>
<li>
<p>In the field Increment, type 1.</p>
</li>
<li>
<p>In the field Start with, type 1.</p>
</li>
<li>
<p>Deselect the check box <span class="bold">Cycle</span>.</p>
</li>
<li>
<p>Select the check box <span class="bold">Order</span>.</p>
</li>
<li>
<p>Click <span class="bold">OK</span>.</p>
<p>The sequence <code>EVALUATIONS_SEQ</code> is created. To see it, expand Sequences in the navigation frame.</p>
</li>
</ol>
<div class="helpinfonotealso">
<h2>Related Topics</h2>
<p><a href="javascript:open('http://www.oracle.com/pls/db112/lookup?id=RPTUG20400','newWindow').focus()"><span class="italic">Oracle Database SQL Developer User's Guide</span></a></p>
<p><a href="javascript:open('http://www.oracle.com/pls/db112/lookup?id=SQLRF01314','newWindow').focus()"><span class="italic">Oracle Database SQL Language Reference</span></a></p>
<p><a href="tdddg_triggers005.htm#BABCGBBD">Tutorial: Creating a Trigger that Generates a Primary Key for a Row Before It Is Inserted</a></p>
<p><a href="tdddg_objects025.htm#BABJICJI">Creating and Managing Sequences</a></p>
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