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On Jan 19, 2017, at 08:30, Vitalii Tymchyshyn <vit@tym.im> wrote:Hi.In SQL "null == any value" resolves to false, so optimizer can safely skip nulls from either side if any for the inner join.Best regards, Vitalii TymchyshynNULL is still a value that may be paired with a NULL in a.aThe only optimization I could see is if the a.a column has NOT NULL defined while b.b does not have NOT NULL defined.Not sure if it is all that common. Curious what if you put b.b IS NOT NULL in the WHERE statement?-----------------Phillip Couto
NULL is still a value that may be paired with a NULL in a.aThe only optimization I could see is if the a.a column has NOT NULL defined while b.b does not have NOT NULL defined.Not sure if it is all that common. Curious what if you put b.b IS NOT NULL in the WHERE statement?-----------------Phillip Couto
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