пятница, 7 апреля 2017 г.

Join elimination rules

comment from extremedb here

I found 7 Rules for Join Elimination in last year

1.Primary Key-Foreign Key – normal join, Starting in 10gR2
2.Primary Key-Foreign Key – ANSI join, Starting in 11gR1
3.Primary Key-Foreign Key – (semi/anti) join, Starting in 11gR1
4.Unique Index – outer join, Starting in 11gR1

Every guru knows above 4 things

5.Primary Key-Primary Key – simple self join, Starting in 11gR2 –> you ‘ve aleady mentioned

There are two more things and one simular thing
6.Primary Key-Primary Key – self join filter subsumption, Starting in 11gR2
7.Join Back Elimination – Using Bit Map Join Index, Starting in 9iR1

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