mysql按1-12月查询统计数据

在mysql中如何实现1-12月份数据的统计查询？

首先我的数据表大概是这样的：

查询sql如下：

SELECT PUR_BILL_TO_NAME AS "公司",DEPT_NAME AS "部门",
 sum( CASE month(T_TIME) WHEN     '1' THEN AUD_P_COUNT ELSE 0 END) AS "一月",
 sum(CASE month(T_TIME) WHEN '2' THEN  AUD_P_COUNT ELSE  0 END ) AS "二月",
 sum(CASE month(T_TIME) WHEN     '3' THEN AUD_P_COUNT ELSE 0 END) AS "三月",
 sum( CASE month(T_TIME) WHEN '4' THEN AUD_P_COUNT ELSE 0  END) AS "四月",
 sum(CASE month(T_TIME) WHEN     '5' THEN AUD_P_COUNT ELSE 0 END) AS "五月",
 sum( CASE month(T_TIME)  WHEN '6' THEN  AUD_P_COUNT ELSE  0 END) AS "六月",
 sum( CASE    month(T_TIME)  WHEN     '7' THEN  AUD_P_COUNT  ELSE  0  END) AS "七月",
 sum( CASE    month(T_TIME)  WHEN '8' THEN   AUD_P_COUNT  ELSE   0  END ) AS "八月",
 sum( CASE    month(T_TIME)  WHEN     '9' THEN  AUD_P_COUNT ELSE  0 END ) AS "九月",
 sum( CASE    month(T_TIME)  WHEN '10' THEN   AUD_P_COUNT  ELSE   0  END ) AS "十月",
 sum( CASE    month(T_TIME)  WHEN     '11' THEN  AUD_P_COUNT  ELSE   0  END ) AS "十一月",
 sum( CASE    month(T_TIME) WHEN '12' THEN  AUD_P_COUNT ELSE   0  END ) AS "十二月",
 sum(  CASE  WHEN 1=1 THEN  AUD_P_COUNT ELSE   0  END ) AS "累计"
FROM
 T_DWS_SRV_CGDM001
 GROUP BY  PUR_BILL_TO_NAME,
    DEPT_NAME ; 

效果如下：