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2012-11-20T14:38:07.860
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2012-11-20T14:51:02.430
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You can do this: <pre><code>;WITH CTE AS ( SELECT pih.PID, piv.TSV, piv.Variable_ID, piv.Value_ID, piv.Manual_Value, ROW_NUMBER() OVER (PARTITION BY piv.TSV ORDER BY pih.PID) rownum FROM Process_Instance_Value AS piv INNER JOIN Process_Instance_History AS pih ON piv.PID = pih.PID WHERE piv.Variable_ID IN ( SELECT Variable_ID FROM someTable WHERE Transition_ID = @someValue) AND piv.PID = @someValue ) SELECT * FROM CTE WHERE rownum = 1; </code></pre> Note that: This will return the minimum <code>pih.PID</code> for each distinct <code>piv.TSV</code> if you want the max, just use <code>ORDER BY pih.PID DESC</code> instead. How does this work: The ranking function <a href="http://msdn.microsoft.com/en-us/library/ms186734.aspx" rel="nofollow"><code>ROW_NUMBER() OVER()</code></a> will give a ranking number for each group that has the same column listed in the <code>PARTITION BY</code>, in our case <code>piv.TSV</code>, this ranking number will be ordered, for each group, according to the <code>ORDER BY</code> clause defined inside the <code>OVER</code> clause, in our case <code>ORDER BY pih.PID</code>. I used a <a href="http://msdn.microsoft.com/en-us/library/ms190766%28v=sql.105%29.aspx" rel="nofollow">CTE</a> instead of using subquery. Then the I used <code>WHERE rownum = 1</code>, since the ranking number <code>rownum</code> was given for each group of records that has the same <code>piv.TSV</code> ranked in descendent order, then the record with <code>rownum = 1</code> will be the record with the minimum <code>pih.PID</code>(think about it). You can however, get the same result using an inner join with a <code>GROUP BY</code> like so: <pre><code> SELECT pih.PID, piv.TSV, piv.Variable_ID, piv.Value_ID, piv.Manual_Value FROM Process_Instance_Value AS piv INNER JOIN ( SELECT TSV, MIN(PID) MinPID FROM Process_Instance_Value GROUP BY TSV ) piv2 ON piv.PID = piv2.MinPID INNER JOIN Process_Instance_History AS pih ON piv.PID = pih.PID WHERE piv.Variable_ID IN ( SELECT Variable_ID FROM someTable WHERE Transition_ID = @someValue) AND piv.PID = @someValue </code></pre>
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