How to convert a Subquery into a Join?

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  • John Roberts
    New Member
    • Nov 2010
    • 4

    #1

    How to convert a Subquery into a Join?

    Hi guys,

    The below SQL statement returns a requirement name and the SUM of the number of number of tests run in each test related to that requirement for Release 10. To filter on a particular release, I need to convert this statement into an equivalent INNER JOIN because 'Tests_run' isn't the only attribute for a test I need to return.

    Please help! Here's the current SQL subquery statement.

    SELECT Requirement.Nam e
    (SELECT SUM(Test_Status .Run)
    FROM Test_Status, Test_Lookup, Test_Script
    WHERE Test_Lookup.Tes t=Test_Scripts. ID
    AND Test_Status.Tes t=Test_Script.T est_Script_Test
    AND Test_Lookup.Req uirement=Requir ement.ID
    AND Test_Status.Rel ease=10) AS Tests_Run,
    FROM Requirement


    Thanks very much.
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