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Update table when inner select returns 1 row

 
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morpheus007

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Joined: 27 Dec 2005
Posts: 58

PostPosted: Thu Nov 22, 2007 6:06 am    Post subject: Update table when inner select returns 1 row
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We have a requirement to Update a table only when an inner Select statement returns 1 row as result.If the select returns anything other than 1 row then the outer update must not run.

Kindly let me know how to code the query.The query has to be outside the programming environment as it will be run from jcl.
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stodolas

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Joined: 13 Jun 2007
Posts: 632
Location: Wisconsin

PostPosted: Thu Nov 22, 2007 6:36 pm    Post subject:
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Based on my experience, this is not possible. You need to check how many rows are returned from the SELECT before running the update. It needs to be done in 2 steps with a check between the 2 of them or the inner SELECT needs to have a scalar function or a FETCH FIRST 1 ROWS ONLY in it to force the get of only one row.
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