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mysql join: left right inner

vẫn cứ hay quên
Added by about 3 years ago  »  Votes: 1/1

Bà con không hiểu thì xem ở wellho.net

A join B       : A\cap B
A left  join B : A\B + (A\cap B)   (all items in A are mentioned)
A right join B : (B\cap A) + B\A   (all items in B are mentioned)

Câu hỏi: B right join A có trùng với A left join B không?


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