sql group by sum

时间：2021-02-04 11:42:00 收藏：0 阅读：0

1.表字段如下图，要求：分区计算总处数，总面积，已处理数，已处理面积，未处理数，未处理面积

技术图片

2.计算结果如下：

技术图片

3.sql如下：知识点：sum后的case可以根据A列状态，来计算B列的值。

sum(case when sfcl=‘否‘then mjm else 0 end) wcltbmj

 1 select max(xzqmc2) qymc,0 as hzbs,
 2 sum(mjm) as bhmj,
 3 count(sfcl) as bhs,
 4 sum(case when sfcl=‘是‘then 1 else 0 end) ycltbs ,
 5 sum(case when sfcl=‘是‘then mjm else 0 end) ycltbmj,
 6 sum(case when sfcl=‘否‘then 1 else 0 end) wcltbs ,
 7 sum(case when sfcl=‘否‘then mjm else 0 end) wcltbmj
 8 from zz_ygyswftb where pcsid = #{pcid} group by xzqmc2
 9 union
10 select ‘萍乡‘ qymc,1 as hzbs,
11 sum(mjm) as bhmj,
12 count(sfcl) as bhs,
13 sum(case when sfcl=‘是‘then 1 else 0 end) ycltbs ,
14 sum(case when sfcl=‘是‘then mjm else 0 end) ycltbmj,
15 sum(case when sfcl=‘否‘then 1 else 0 end) wcltbs ,
16 sum(case when sfcl=‘否‘then mjm else 0 end) wcltbmj
17 from zz_ygyswftb where pcsid = #{pcid}