mysql列转行以及年月分组

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mysql列转行以及年月分组

来源: 作者: 时间:2016-02-05 10:57 【

mysql列转行以及年月分组Java代码 SELECT count(DISTINCT(a rect_id)) zcount, a job_dept, DATE_FORMAT(submit_date, 39;%Y-%m 39;) zsubmit_date FROM
mysql列转行以及年月分组
 
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。用法等同于if else
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