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Nguyễn Thái Sơn Professional
Asked At: 1670130162000 In: Database
Nguyễn Thái Sơn Professional Asked At: 1670130162000 In: Database
Nên dùng subquery-truy vấn con hay Join tốt hơn
Anh ơi, có 2 cách join và dùng truy vấn con để lấy dữ liệu 2 bảng, vậy cách nào cho hiệu năng tốt hơn trong trường hợp nào ạ.
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Vu Luong Anh Pundit
Added an answer at: 1670133015000
Vu Luong Anh Pundit
Added an answer at: 1670133015000
https://dev.mysql.com/doc/refman/5.7/en/rewriting-subqueries.html
) có đề cập:
A LEFT [OUTER] JOIN can be faster than an equivalent subquery because the server might be able to optimize it better—a fact that is not specific to MySQL Server alone.
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