题解 | #MYSQL开窗函数#
牛客每个人最近的登录日期(三)
http://www.nowcoder.com/practice/16d41af206cd4066a06a3a0aa585ad3d
SELECT
round(
sum( CASE WHEN date = date_add( d, INTERVAL 1 DAY ) THEN 1 ELSE 0 END )* 1
/ sum( CASE WHEN date = d THEN 1 ELSE 0 END ),
3)
FROM
( SELECT *, min( date ) over ( PARTITION BY user_id ) d FROM login ) AS t
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