Comments on: update single row error http://itknowledgeexchange.techtarget.com/itanswers/update-single-row-error/ Tue, 18 Jun 2013 06:50:50 +0000 hourly 1 By: tudz drkl http://itknowledgeexchange.techtarget.com/itanswers/update-single-row-error/#comment-50463 tudz drkl Thu, 25 Oct 2007 13:09:23 +0000 #comment-50463 Your update query will work – this is a very common update method – only if the correlated subquery returns only one row for each mfr_code. Check your data by looking for multiple rows by GROUPING BY mfr_code. Also make sure you do not have any NULL mfr_codes. Another good practice is to always add an exists clause to a correlated update. This exist clause will include the same join criteria and predicates as the update subquery and ensure you do not update rows not intended for update:

AND EXISTS ( SELECT 1
FROM eqp_mfr_names
WHERE mfr_code = p.mfrcode)

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