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Asked: 2026-05-28T11:08:18+00:00

In a typical stored procedure i am working there are various checks with the

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In a typical stored procedure i am working there are various checks with the same query as below.

SELECT ... FROM Projects WHERE ProjectId IN (SELECT ProjectId FROM Tasks)

i would like to replace the query (SELECT ProjectId FROM Tasks) with a variable but am confused as to what datatype it has to be. Do you know? also caching this result is detrimental or is there easier way to doing this.

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1 Answer

  1. Editorial Team

    You may cteate table typed variable and use it multiple times, like that:

    CREATE @Projects TABLE(Id INT NOT NULL)

INSERT @Projects SELECT ProjectId FROM Tasks

SELECT ... FROM Projects WHERE ProjectId IN (SELECT ProjectId FROM @Projects)
SELECT ... FROM Projects WHERE ProjectId NOT IN (SELECT ProjectId FROM @Projects)

    Althought – it is not replacement of query by variable, it is make more reusable the subquery results

    But

    under certain conditions this may degrade your queries’ performance

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