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')

其中關鍵在于DATE_FORMAT(submit_date, '%Y-%m')對時間年月進行了分組排序

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

以上是mysql的列轉行。其中關鍵點是case when的用法，用其來完成列轉行的操作。用法等同于if else

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