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POSQL Server 2008 MERGE with Target as table with no values
 

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    <p>I want to do MERGE from a source to a Target where I insert rows if they don't exist and update the ones that do. When I do this, I get only inserts... no updates. I read this post (http://stackoverflow.com/questions/5015623/merge-query-in-sql-server-2008), which is a bit confusing for me to follow, but it seems that I need a duplicate source to make this happen. Can someone explain why a DUPLICATE source would be required? I just don't get it, especially which keys I should be using (duplicate source or regular ones)-- Maybe the duplicate SourceTable is just not needed?</p> <p>here my (simplified) SourceTable :</p> <pre><code> row userid placervalue placerDt --- ------- ---------- ---------- 1 abc a1 1/1/12 2 xyz b1 1/1/12 3 abc b2 1/20/12 etc. </code></pre> <p>and my target TargetTable that is same, but currently with no rows in it.</p> <pre><code> row userid placerId --- ------- ---------- (nothing loaded yet) </code></pre> <p>what I want is to INSERT rows that are NOT in the target, and UPDATE rows that are.</p> <pre><code> row userid placervalue placerDt --- ------- ---------- ---------- 1 abc a1 1/20/12 *** note change here (row 3 updates row 1) 2 xyz b1 1/1/12 </code></pre> <p>When I run this code, I get only inserts (would also like to know why)</p> <pre><code>MERGE TargetTable as t USING SourceTable as s ON s.userid = t.usrid AND s.placervalue = t.placervalue WHEN MATCHED THEN UPDATE SET t.placerDt = s.placerDt WHEN NOT MATCHED THEN INSERT ( userid , placerid , placerDt ) VALUES ( s.userid , s.placerid , s.placerDt ); </code></pre>
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