总和上的列名无效

Question

我正在尝试执行sql语句

select buyer, issuer, ident, sum(qnty) as sum1
from palete
where sum1 <> 0
group by buyer, issuer, ident

我收到了错误 列名称“sum1”无效。

问题是我得到了很多结果，所以我想在sum1为0的情况下避免这些结果。

感谢您的帮助！

Answer 1

替代，没有子查询：

select buyer, issuer, ident, sum(qnty) as sum1 
from palete 
group by buyer, issuer, ident 
having sum(qnty) <> 0

Answer 2

别名在where子句中不被识别。你需要这样做：

select buyer, issuer, ident, sum(qnty) as sum1 
from palete 
group by buyer, issuer, ident 
having sum(qnty) <> 0

Answer 3

select * from
(
  select buyer, issuer, ident, sum(qnty) as sum1 from palete group by buyer, issuer, ident
) as T1 where T1.sum1 <> 0

Answer 4

您需要使用HAVING子句而不是WHERE子句。

SQL HAVING子句与SELECT子句一起使用，以指定组或聚合的搜索条件。 HAVING子句的行为类似于WHERE子句，但适用于组 - 结果集中表示组的行。相反，WHERE子句适用于单个行，而不适用于组。

希望这有帮助。