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Library/Kiến trúc & Database/Cơ sở dữ liệu
Easy#database

Thứ tự thực thi (Logical Processing Order) của một câu lệnh SQL SELECT diễn ra như thế nào?

February 15, 2026

Quick summary

In SQL, the logical processing order of a query differs significantly from its written lexical order. Understanding this sequence explains why you cannot use a `SELECT` alias in the `WHERE` clause, but can safely use it in `ORDER BY`.

Sample answer:

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam.

Quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore.

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