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Window Functions trong SQL là gì? Phân biệt ROW_NUMBER, RANK và DENSE_RANK · ORA·tech

Nâng cao Pro#database

Window Functions trong SQL là gì? Phân biệt ROW_NUMBER, RANK và DENSE_RANK

15 tháng 2, 2026

Tóm tắt nhanh

Window Functions thực hiện tính toán trên một tập hợp các dòng có liên quan (cửa sổ) nhưng vẫn giữ nguyên các dòng riêng biệt thay vì gộp (collapse) chúng lại như `GROUP BY`. Sự khác biệt cốt lõi giữa `ROW_NUMBER`, `RANK` và `DENSE_RANK` nằm ở cách chúng xử lý và đánh số cho các giá trị đồng hạng (trùng lặp).

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