Re: Subquery returning NULL, why?
Posted by:
Rick James
Date: January 13, 2016 05:45PM
SELECT t3.a
FROM tbl_test t3
LEFT JOIN tbl_test t4 ON t4.b = 999
WHERE t3.a = t2.a
Says to look into t3, then check t4, but don't do anything with the result of looking into t4.
What were you hoping to do with that LEFT JOIN?
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Re: Subquery returning NULL, why?
January 13, 2016 05:45PM
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