sql group by sum

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

 2.计算结果如下：

 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

select max(xzqmc2) qymc,0 as hzbs,
sum(mjm) as bhmj,
count(sfcl) as bhs,
sum(case when sfcl='是'then 1 else 0 end) ycltbs ,
sum(case when sfcl='是'then mjm else 0 end) ycltbmj,
sum(case when sfcl='否'then 1 else 0 end) wcltbs ,
sum(case when sfcl='否'then mjm else 0 end) wcltbmj
from zz_ygyswftb where pcsid = #{pcid} group by xzqmc2
union
select '萍乡' qymc,1 as hzbs,
sum(mjm) as bhmj,
count(sfcl) as bhs,
sum(case when sfcl='是'then 1 else 0 end) ycltbs ,
sum(case when sfcl='是'then mjm else 0 end) ycltbmj,
sum(case when sfcl='否'then 1 else 0 end) wcltbs ,
sum(case when sfcl='否'then mjm else 0 end) wcltbmj
from zz_ygyswftb where pcsid = #{pcid}