Question

以下是我的查询文本，其中包含语法错误。

select cc, sum(a.hours),b.labcost
from labour a,othshop b
where lab_cd='hs' and a.mon=03 and a.yr=2010
group by a.cc
HAVING a.cc=b.occ AND b.mon=03 and b.yr=2010;

所有表都存在。这个查询的文本有什么问题？

Answer 1

having中没有必要，只需：

select a.cc, sum(a.hours),b.labcost
from labour a,othshop b
where lab_cd='hs' and a.mon=03 and a.yr=2010
and a.cc=b.occ AND b.mon=03 and b.yr=2010
group by a.cc, b.labcost

请注意b.labcost已添加GROUP BY。否则，您需要对其执行聚合，例如avg(b.labcost)

查询的语法有什么问题？

1 个答案: