Hi anh và mọi ng, ngoài cách thông dùng là Indexing, mọi ng còn dùng những cách optimize nào ạ
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Ngoài dùng index thì em cũng phải chú ý đến việc lấy dữ liệu vừa đủ, nghĩa là lấy các trường cần lấy thôi thay vì lấy hết.