SQL Server / T-SQL : How to update equal percentages of a resultset?
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by Kent Comeaux
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Published on 2010-05-10T17:02:06Z
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2010/05/10
17:34 UTC
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I need a way to take a resultset of KeyIDs and divide it up as equally as possible and update records differently for each division based on the KeyIDs. In other words, there is
SELECT KeyID
FROM TableA
WHERE (some criteria exists)
I want to update TableA 3 different ways by 3 equal portions of KeyIDs.
UPDATE TableA
SET FieldA = Value1
WHERE KeyID IN (the first 1/3 of the SELECT resultset above)
UPDATE TableA
SET FieldA = Value2
WHERE KeyID IN (the second 1/3 of the SELECT resultset above)
UPDATE TableA
SET FieldA = Value3
WHERE KeyID IN (the third 1/3 of the SELECT resultset above)
or something to that effect. Thanks for any and all of your responses.
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