mysql 分布函數 PERCENT_RANK()、CUME_DIST()

 

 

PERCENT_RANK()

每行按照公式(rank-1) / (rows-1)進行計算。其中，rank為RANK()函數產生的序號，rows為當前窗口的記錄總行數

CUME_DIST()

分組內小於、等於當前rank值的行數 / 分組內總行數

SELECT id, score
, rank() OVER (ORDER BY score DESC) AS 'rank'
, dense_rank() OVER (ORDER BY score DESC) AS 'dense_rank'
, row_number() OVER (ORDER BY id DESC) AS 'row_number'
, row_number() OVER (partition by score ORDER BY id DESC) AS 'row_number1'
, PERCENT_RANK() OVER (ORDER BY score DESC) AS 'PERCENT_RANK'
, CUME_DIST() OVER (ORDER BY score) AS 'CUME_DIST'
, CUME_DIST() OVER (PARTITION BY score ORDER BY id) AS 'CUME_DIST1'
FROM scores
order by id

 

https://blog.csdn.net/Hzfeng666/article/details/109612895