mysql列转行以及年月分组实例

如下所示： SELECT count(DISTINCT(a.rect_id)) zcount, a.job_dept,DATE_FORMAT(submit_date, '%Y-%m') zsubmit_dateFROM表名 aWHEREa.statu = 3AND a.rstatu = 2AND a.job_dept IN ('19', '20', '21')GROUP BYa.job_dept,DATE_FORMAT(submit_date, '

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

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