关于测试住房维修资金平衡的问题与方法

1-select sum(grye) grye, sum(zhye) zhye from fwxx;--grye等于zhye2-select sum(snjz) + sum(grjc) - sum(grtq) from fwxx; --sum(snjz)+sum(grjc)-sum(grtq)等于zhye这个待定
3-select sum(grbf) grbf, sum(yjhj) yjhj from fwxx;--grbf等于yjhj
4-select sum(zhye)-sum(zzye)-sum(bjye) from fwxx;--结果为0
5-select sum(zhye)-sum(grjc)-sum(snjz)-sum(grtq) from fwxx;
--应该等于0不过也待定
6-select sum(df)-sum(jf) from ywls
--结果为0
7-select sum(df)-sum(jf) from fwls--结果为zhye