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POOptimize this UPDATE statement to not use cursors
 

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    <pre><code>FOR v2 AS c2 CURSOR FOR SELECT he.MyPrimary, he.SomeCode, he.SomeName, pe.MyPrimary FROM SomeTable he INNER JOIN AnotherTable pe ON (he.ColOne = pe.FooOne AND he.ColTwo = pe.ColTwo AND he.ColThree = pe.FooOne AND he.SomeCode = pe.SomeCode) WHERE he.relevancy = 1 AND he.ColThree = '2011-01-05' AND he.ColFive = 9 DO UPDATE AnotherTable SET match = he.MyPrimary, FooTwo = he.SomeCode, SomeName = he.SomeName WHERE MyPrimary = pe.MyPrimary; END FOR; </code></pre> <p>I have the above code and I'm trying to do this without using cursors but I'm not sure how to do an <code>UPDATE</code> statement with an <code>INNER JOIN</code>. Basically, what I'd like to do is join two tables <code>SomeTable</code> and <code>AnotherTable</code> then based on some column values from <code>SomeTable</code>, copy the value to a similar column in <code>AnotherTable</code>. I'm using DB2.</p> <p><strong>EDIT:</strong> I was just looking into this: <a href="https://stackoverflow.com/questions/4184209/inner-join-in-update-sql-for-db2">INNER JOIN in UPDATE sql for DB2</a></p> <p>Would it make sense to do something like this instead:</p> <pre><code>UPDATE SomeTable pe SET match = (SELECT he.MyPrimary FROM SomeTable he WHERE he.ColOne = pe.FooOne AND he.ColTwo = pe.ColTwo AND he.ColThree = pe.FooOne AND he.SomeCode = pe.SomeCode ), FooTwo = (SELECT he.SomeCode FROM SomeTable he WHERE he.ColOne = pe.FooOne AND he.ColTwo = pe.ColTwo AND he.ColThree = pe.FooOne AND he.SomeCode = pe.SomeCode ) WHERE he.relevancy = 1 AND he.ColThree = '2011-01-05' AND he.ColFive = 9 </code></pre>
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