查詢每月新增使用者數

celsp_users是使用者表

createTime 為新增使用者時間

SELECT a.count,b.time2 from  
(select count(c.createTime) as count,FROM_UNIXTIME( UNIX_TIMESTAMP(c.createTime),'%m' ) as mon 
from celsp_users c where  FROM_UNIXTIME( UNIX_TIMESTAMP(c.createTime),'%Y' ) = '2015' GROUP BY mon) a 
RIGHT JOIN (SELECT '01' as time2 from  DUAL UNION ALL  
SELECT '02' as time2 from  DUAL UNION ALL 
SELECT '03' as time2 from  DUAL UNION ALL 
SELECT '04' as time2 from  DUAL UNION ALL 
SELECT '05' as time2 from  DUAL UNION ALL 
SELECT '06' as time2 from  DUAL UNION ALL 
SELECT '07' as time2 from  DUAL UNION ALL 
SELECT '08' as time2 from  DUAL UNION ALL 
SELECT '09' as time2 from  DUAL UNION ALL 
SELECT '10' as time2 from  DUAL UNION ALL 
SELECT '11' as time2 from  DUAL UNION ALL 
SELECT '12' as time2 from  DUAL )b on a.mon = b.time2

結果集