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  1. PO
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    <p>You could rewrite it as one single select of 4-part UNION ALL.</p> <p>I also notice that your conditions are not comprehensive, not sure if that is intentional.</p> <p>In the 2nd branch of <code>@PoolID = 0</code> , the tests are specifically <code>@Bevoegdheid &lt; 3</code> and <code>@Bevoegdheid &gt;= 3</code> (instead of ELSE ) which will do nothing if <code>@Bevoegdheid IS NULL</code></p> <p>The optimizer will only run the branch that fits the criteria marked with &lt;&lt;&lt;</p> <pre><code>ALTER PROCEDURE [dbo].[Pool_select] @PartnerCode nvarchar(8), @GebrID int, @PoolID int, @Bevoegdheid int -- WITH RECOMPILE -- &lt;&lt; may need this AS SELECT p.*, pr.poolrecht FROM racpPool p, racpPoolrecht pr WHERE p.poolid = pr.poolid and p.PartnerCode = @PartnerCode and pr.poolrecht &gt; 0 and p.actief = 1 and pr.GebrID = @GebrID AND @PoolID = 0 and @Bevoegdheid &lt; 3 --- &lt;&lt;&lt; UNION ALL SELECT *, NULL FROM racpPool p WHERE standaardpool = 1 and partnercode = @PartnerCode AND @PoolID = 0 and IsNull(@Bevoegdheid,4) &gt;= 3 --- &lt;&lt;&lt; UNION ALL SELECT p.*, pr.poolrecht FROM racpPool p, racpPoolrecht pr WHERE p.poolid = pr.poolid and p.PartnerCode = @PartnerCode and pr.poolrecht &gt; 0 and p.actief = 1 and pr.GebrID = @GebrID and p.PoolID = @PoolID AND Isnull(@PoolID,-1) &lt;&gt; 0 AND @Bevoegdheid &lt; 3 --- &lt;&lt;&lt; UNION ALL SELECT *, NULL FROM racpPool p WHERE PoolID = @PoolID AND Isnull(@PoolID,-1) &lt;&gt; 0 AND @Bevoegdheid &gt;= 3 --- &lt;&lt;&lt; </code></pre>
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    1. USRichardTheKiwi
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    1. COThx for your code which is better than mine. My problem was that I didn't pass my variables in the same order as my variables in the stored procedure. Really weird...
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