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    <p>It was used for "<a href="http://www.google.co.uk/search?&amp;q=intermediate+materialization" rel="noreferrer">intermediate materialization (Google search)</a>"</p> <p>Good article: <a href="http://sqlblog.com/blogs/adam_machanic/archive/2006/10/03/exploring-the-secrets-of-intermediate-materialization.aspx" rel="noreferrer">Adam Machanic: Exploring the secrets of intermediate materialization</a></p> <p>He even raised <a href="http://connect.microsoft.com/SQLServer/feedback/ViewFeedback.aspx?FeedbackID=218968" rel="noreferrer">an MS Connect</a> so it can be done in a cleaner fashion</p> <p>My view is "not inherently bad", but don't use it unless 100% sure. The problem is, it works only at the time you do it and probably not later (patch level, schema, index, row counts etc)...</p> <h2>Worked example</h2> <p>This may fail because you don't know in which order things are evaluated</p> <pre><code>SELECT foo From MyTable WHERE ISNUMERIC (foo) = 1 AND CAST(foo AS int) &gt; 100 </code></pre> <p>And this may also fail because</p> <pre><code>SELECT foo FROM (SELECT foo From MyTable WHERE ISNUMERIC (foo) = 1) bar WHERE CAST(foo AS int) &gt; 100 </code></pre> <p>However, this did not in SQL Server 2000. The inner query is evaluated and spooled:</p> <pre><code>SELECT foo FROM (SELECT TOP 100 PERCENT foo From MyTable WHERE ISNUMERIC (foo) = 1 ORDER BY foo) bar WHERE CAST(foo AS int) &gt; 100 </code></pre> <p>Note, this still works in SQL Server 2005</p> <pre><code>SELECT TOP 2000000000 ... ORDER BY... </code></pre>
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    1. POWhy use Select Top 100 Percent?
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    1. COWhy does the second query fail? Because the inner query isn't (necessarily) fully evaluated?
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    2. COThat second link explains why creating temp tables sometimes results in dramatic performance improvements!
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