mysql列转行以及年月分分组实例有哪些？
mysql列转行以及年月分分组实例有哪些？
如下所示：
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
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
以上这篇mysql列转行以及年月分组实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持路饭。