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Calculated Field in Where Clause
Message
Information générale
Forum:
Microsoft SQL Server
Catégorie:
Syntaxe SQL
Divers
Thread ID:
01451981
Message ID:
01452033
Vues:
59
>In VFP you can do this
>
>Select somefield+somethingelse as mycalcfield from mytable where mycalcfield>10
>
>in T-SQL it seems you have to do this
>Select somefield+somethingelse as mycalcfield from mytable where somefield+somethingelse>10
>
>which means you have to maintain both calcfield expressions which is a maintenance headache
>
>Is there a way in T-SQL to use the calcfield alias in the where expression?


You can also use CROSS APPLY:

SELECT MyCalcField
FROM MyTable
CROSS APPLY (SELECT SomeField+SomethingElse AS MyCalcField) F
WHERE MyCalcField>10

That will produce the same query plan as the query you wrote above.

--Brad
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