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丸趣 TV 小編給大家分享一下 MySQL 使用變量如何實現各種排序，希望大家閱讀完這篇文章后大所收獲，下面讓我們一起去探討吧！

-- 下面我演示下 MySQL 中的排序列的實現
-- 測試數據
CREATE TABLE tb
score INT
INSERT tb SELECT 
5 UNION ALL SELECT 
4 UNION ALL SELECT 
4 UNION ALL SELECT 
4 UNION ALL SELECT 
3 UNION ALL SELECT 
2 UNION ALL SELECT
--1.row_number 式的排序
SET @row_number =0;
SELECT @row_number := @row_number+1 AS row_number,score 
FROM tb 
ORDER BY score DESC ;
+------------+-------+
| row_number | score |
+------------+-------+
| 1 | 5 |
| 2 | 4 |
| 3 | 4 |
| 4 | 4 |
| 5 | 3 |
| 6 | 2 |
| 7 | 1 |
+------------+-------+
--2.dense_rank 式的排序
SET @dense_rank = 0,@prev_score = NULL;
SELECT @dense_rank :=IF(@prev_score=score,@dense_rank,@dense_rank+1) AS decnse_rank,
 @prev_score := score AS score 
FROM tb 
ORDER BY score DESC ; 
+-------------+-------+
| decnse_rank | score |
+-------------+-------+
| 1 | 5 |
| 2 | 4 |
| 2 | 4 |
| 2 | 4 |
| 3 | 3 |
| 4 | 2 |
| 5 | 1 |
+-------------+-------+
--3.rank 式的排序
SET @row=0,@rank=0,@prev_score=NULL;
SELECT @row:=@row+1 AS ROW,
 @rank:=IF(@prev_score=score,@rank,@row) AS rank,
 @prev_score:=score AS score
FROM tb 
ORDER BY score DESC;
+------+------+-------+
| ROW | rank | score |
+------+------+-------+
| 1 | 1 | 5 |
| 2 | 2 | 4 |
| 3 | 2 | 4 |
| 4 | 2 | 4 |
| 5 | 5 | 3 |
| 6 | 6 | 2 |
| 7 | 7 | 1 |
+------+------+-------+

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