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Library/Kiến trúc & Database/PostgreSQL
Medium Pro#postgresql

Tại sao thứ tự cột trong Composite Index quan trọng và quy tắc thiết kế tối ưu là gì?

February 15, 2026

Quick summary

Column order determines index usability based on the Leftmost Prefix Rule. The core optimization rule is to place high-cardinality equality (`=`) columns first, followed by range filter columns (`<`, `>`, `BETWEEN`), and finally sorting columns (`ORDER BY`).

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