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POCan a DB2 WITH statement be used as part of an UPDATE or MERGE?
 

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  1. POCan a DB2 WITH statement be used as part of an UPDATE or MERGE?
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    <p>I need to update some rows in a DB table. How I identify the rows to be updated involved a series of complicated statements, and I managed to boil them down to a series of WITH statements. Now I have the correct data values, I need to update the table.</p> <p>Since I managed to get these values with a WITH statement, I was hoping to use it in the UPDATE/MERGE. A simplified example follows:</p> <pre><code>with data1 ( ID_1 ) as ( Select ID from ID_TABLE where ID &gt; 10 ) , cmedb.data2 ( MIN_ORIGINAL_ID ,OTHER_ID ) as ( Select min(ORIGINAL_ID) ,OTHER_ID from OTHER_ID_TABLE where OTHER_ID in ( Select distinct ID_1 From data1 ) group by OTHER_ID ) select MIN_ORIGINAL_ID ,OTHER_ID from cmedb.data2 </code></pre> <p>Now I have the two columns of data, I want to use them to update a table. So instead of having the select at the bottom, I've tried all sorts of combinations of merges and updates, including having the WITH statement above the UPDATE/MERGE, or as part of the UPDATE/MERGE statement. The following is what comes closest in my mind to what I want to do:</p> <pre><code>merge into ID_TABLE as it using ( select MIN_ORIGINAL_ID ,OTHER_ID from cmedb.data2 ) AS SEL ON ( it.ID = sel.OTHER_ID ) when matched then update set it.ORIGINAL_ID = sel.MIN_ORIGINAL_ID </code></pre> <p>So it doesn't work. I'm unsure if this is even possible, as I've found no examples on the internet using WITH statements in combination with UPDATE or MERGE. I have examples of WITH statements being used in conjunction with INSERT, so believe it might be possible.</p> <p>If anyone can help it would be great, and please let me know if I've left out any information that would be useful to solve the problem.</p> <p>Disclaimer: The example I've provided is a boiled down version of what I'm trying to do, and may not actually make any sense!</p>
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