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POHow do I force SQL Server 2005 to run a join before the where?
 

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  1. POHow do I force SQL Server 2005 to run a join before the where?
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    <p>I've got a SQL query that joins a pricing table to a table containing user-provided answers. My query is used to get the price based on the entered quantity. Below is my SQL statement:</p> <pre><code>SELECT JobQuestion.Value, Price.Min, Price.Max, Price.Amount FROM Price INNER JOIN JobQuestion ON Price.QuestionFK=JobQuestion.QuestionFK AND JobQuestion.JobFK=1 WHERE Price.Min &lt;= JobQuestion.Value AND Price.Max &gt;= JobQuestion.Value </code></pre> <p>The problem is SQL Server is running the where clause before the JOIN and it is throwing the error:</p> <blockquote> <p>Conversion failed when converting the varchar value 'TEST' to data type int.</p> </blockquote> <p>because it is doing the min and max comparisons before the join ('TEST' is a valid user entered value in the JobQuestion table, but should not be returned when JobQuestion is joined to Price). I believe SQL Server is choosing to run the WHERE because for some reason the parser thinks that would be a more efficient query. If i Just run</p> <pre><code>SELECT JobQuestion.Value, Price.Min, Price.Max, Price.Amount FROM Price INNER JOIN JobQuestion ON Price.QuestionFK=JobQuestion.QuestionFK AND JobQuestion.JobFK=1 </code></pre> <p>I get these results back: </p> <pre><code>500 1 500 272.00 500 501 1000 442.00 500 1001 2000 782.00 </code></pre> <p>So, adding the WHERE should filter out the last two and just return the first record. How do I force SQL to run the JOIN first or use another technique to filter out just the records I need?</p>
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