mysql年月分组语句_MySQL

mysql年月分组语句

Java代码

SELECT count(DISTINCT(a.rect_id)) zcount, a.job_dept,

DATE_FORMAT(submit_date, '%Y-%m') zsubmit_date

FROM

表名 a

WHERE

a.statu = 3

AND a.rstatu = 2

AND a.job_dept IN ('19', '20', '21')

GROUP BY

a.job_dept,

DATE_FORMAT(submit_date, '%Y-%m')

其中关键在于DATE_FORMAT(submit_date, '%Y-%m')对时间年月进行了分组排序

Java代码

SELECT

zsubmit_date,

MAX(CASE WHEN job_dept = '19' THEN zcount ELSE 0 END ) 19zcount,

MAX(CASE WHEN job_dept = '20' THEN zcount ELSE 0 END ) 20zcount,

MAX(CASE WHEN job_dept = '21' THEN zcount ELSE 0 END ) 21zcount

FROM

(

SELECT

count(DISTINCT(a.rect_id)) zcount, a.job_dept,

DATE_FORMAT(submit_date, '%Y-%m') zsubmit_date

FROM

表名 a

WHERE

a.statu = 3

AND a.rstatu = 2

AND a.job_dept IN ('19', '20', '21')

GROUP BY

a.job_dept,

DATE_FORMAT(submit_date, '%Y-%m')

) q

GROUP BY

zsubmit_date

以上是mysql的列转行。其中关键点是case when的用法，用其来完成列转行的操作。