数据表如下：
①DENSE_RANK()排序
oracle中的dense_rank()排序
排序效果如下：
MySQL实现的语句代码如下：
方法一：
SET @RANK=0;
SET @PREScore=0;
SELECT Score,
CASE
WHEN @PREScore=Score THEN @RANK
WHEN @PREScore:=Score THEN @RANK:[email protected]+1
END AS RANK
FROM scores
ORDER BY Score DESC; 方法二：
SET @RANK=0;
SET @PREScore=0;
SELECT Score,RANk FROM(
SELECT Score,IF(@PREScore=Score,@RANK,@RANK:[email protected]+1) AS RANK,
@PREScore:=Score
FROM scores
ORDER BY Score DESC)S; ②ROW_NUMBER()
oracle中的row_number()排序
排序效果如下：
MySQL实现的语句代码如下：
SET @RANK=0;
SELECT Score,@RANK:[email protected]+1
FROM scores
ORDER BY Score DESC;
③RANK()排序
oracle中的rank()排序
排序效果如下：
MySQL实现的语句代码如下：
SET @RANK=0;
SET @PREScore=0;
SET @INCRANK=1;
SELECT Score,RANK FROM(
SELECT Score,@RANK:=IF(@PREScore=Score,@RANK,@INCRANK) AS RANK,
@PREScore:=Score,
@INCRANK:[email protected]+1
FROM scores
ORDER BY Score DESC
)S;