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POWHERE condition issue in SQL
 

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    <p>I am facing problem with an SQL query:</p> <p>Here is my table data:</p> <pre><code>+------------+--------+--------+------------+------------+ | priceId_PK | mPrice | aPrice | validFrom | validTo | +------------+--------+--------+------------+------------+ | 1 | 0.00 | 0.00 | 2013-07-01 | 2013-08-31 | | 2 | 7.50 | 2.50 | 2013-09-01 | 2013-12-31 | | 3 | 15.00 | 5.00 | 2014-01-01 | 2035-12-31 | +------------+--------+--------+------------+------------+ </code></pre> <p>And my SQL query is</p> <pre><code>SELECT mPrice, aPrice, CASE WHEN validFrom &lt; '2013-11-01' THEN '2013-11-01' ELSE validFrom END AS validFrom, CASE WHEN validTo &gt; '2013-11-30' THEN '2013-11-30' ELSE validTo END AS validTo FROM commission WHERE (validfrom BETWEEN '2013-11-01' AND '2013-11-30' OR validto BETWEEN '2013-11-01' AND '2013-11-30') ORDER BY validFrom </code></pre> <p>My expected result:</p> <pre><code>+--------+--------+------------+------------+ | mPrice | aPrice | validFrom | validTo | +--------+--------+------------+------------+ | 7.50 | 2.50 | 2013-11-01 | 2013-11-30 | +--------+--------+------------+------------+ </code></pre> <p>But the query actually returns an empty set.</p> <p>Without the <code>WHERE</code> condition, the query is</p> <pre><code>SELECT mPrice, aPrice, CASE WHEN validFrom &lt; '2013-11-01' THEN '2013-11-01' ELSE validFrom END AS validFrom, CASE WHEN validTo &gt; '2013-11-30' THEN '2013-11-30' ELSE validTo END AS validTo FROM commission </code></pre> <p>This returns:</p> <pre><code>+--------+--------+------------+------------+ | mPrice | aPrice | validFrom | validTo | +--------+--------+------------+------------+ | 0.00 | 0.00 | 2013-11-01 | 2013-08-31 | | 7.50 | 2.50 | 2013-11-01 | 2013-11-30 | | 15.00 | 5.00 | 2014-01-01 | 2013-11-30 | +--------+--------+------------+------------+ </code></pre> <p>My question is, Why does the query with the <code>WHERE</code> condition return empty data when I expect it to return a single result set?</p> <p>Is it a problem with <a href="https://stackoverflow.com/questions/20425808/sql-execution-order">the execution order of <code>SELECT</code> and <code>WHERE</code> conditions</a>?</p> <p>Or is it another issue with <code>WHERE</code> condition that is not working properly?</p>
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