1-select sum(grye) grye, sum(zhye) zhye from fwxx;
--grye等於zhye
2-select sum(snjz) + sum(grjc) - sum(grtq) from fwxx;
--sum(snjz)+sum(grjc)-sum(grtq)等於zhye這個待定
3-select sum(grbf) grbf, sum(yjhj) yjhj from fwxx;
--grbf等於yjhj
4-select sum(zhye)-sum(zzye)-sum(bjye) from fwxx;
--結果爲0
5-select sum(zhye)-sum(grjc)-sum(snjz)-sum(grtq) from fwxx;
--應該等於0不過也待定
6-select sum(df)-sum(jf) from ywls
--結果爲0
7-select sum(df)-sum(jf) from fwls
--結果爲zhye