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<title>Using CASE Expressions in Queries</title>
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<p><a id="BCGHIIGC" name="BCGHIIGC"></a><a id="TDDDG22580" name="TDDDG22580"></a></p>
<div class="sect2">
<h1>Using CASE Expressions in Queries</h1>
<a name="BEGIN" id="BEGIN"></a>
<p><a id="sthref143" name="sthref143"></a>A <code>CASE</code> expression lets you use <code>IF</code> ... <code>THEN</code> ... <code>ELSE</code> logic in SQL statements without invoking procedures.</p>
<p>The query in the following example uses a <code>CASE</code> expression to show proposed salary increases, based on length of service.</p>
<div class="example"><a id="CHDFCDIF" name="CHDFCDIF"></a><a id="TDDDG174" name="TDDDG174"></a>
<p class="titleinexample">Using a CASE Expression in a Query</p>
<pre xml:space="preserve" class="oac_no_warn">
SELECT LAST_NAME "Name",
HIRE_DATE "Started",
SALARY "Salary",
<span class="bold">CASE</span>
  <span class="bold">WHEN HIRE_DATE &lt; TO_DATE('01-Jan-90') THEN TRUNC(SALARY*1.15, 0)</span>
  <span class="bold">WHEN HIRE_DATE &lt; TO_DATE('01-Jan-95') THEN TRUNC(SALARY*1.10, 0)</span>
  <span class="bold">WHEN HIRE_DATE &lt; TO_DATE('01-Jan-00') THEN TRUNC(SALARY*1.05, 0)</span>
  <span class="bold">ELSE SALARY</span>
<span class="bold">END</span> "Proposed Salary"
FROM EMPLOYEES
WHERE DEPARTMENT_ID = 100
ORDER BY HIRE_DATE;
</pre>
<p>Result:</p>
<pre xml:space="preserve" class="oac_no_warn">
Name                      Started       Salary Proposed Salary
------------------------- --------- ---------- ---------------
Faviet                    16-AUG-94       9000            9900
Greenberg                 17-AUG-94      12000           13200
Chen                      28-SEP-97       8200            8610
Sciarra                   30-SEP-97       7700            8085
Urman                     07-MAR-98       7800            8190
Popp                      07-DEC-99       6900            7245
 
6 rows selected.
</pre></div>

<div class="helpinfonotealso">
<h2>Related Topics</h2>
<p><a href="tdddg_subprograms028.htm#BABCGEIH">Using the CASE Statement</a></p>
<p><a href="javascript:open('http://www.oracle.com/pls/db112/lookup?id=SQLRF20037','newWindow').focus()"><span class="italic">Oracle Database SQL Language Reference</span></a> for more information about <code>CASE</code> expressions</p>
<p><a href="tdddg_selecting010.htm#BCGCCGJF">Using Operators and Functions in Queries</a></p>
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