ORA-00979:不是GROUP BY表达式问题

Question

我正在执行以下请求,我得到一个"ORA-00979:不是GROUP BY表达式"错误.

select distinct 
field1, 
field2, 
field3, 
count(*) as field4, 
field5, 
field6,
case
when smt1>0 then 'Deleted'
when smt2>0 then 'Impacted'
when smt3>0 then 'Unknown'
else 'Clean'
end as field7, 
field8, 
field9, 
field10,
field11, 
field12, 
field13
from (<here a big sub query>) A
group by field1, field2
order by field1, field2

我知道我必须将SELECT的所有列放在GROUP BY语句中,除了分组函数(如MAX或SUM),所以我正在尝试以下查询但是我收到相同的错误消息:

select distinct 
field1, 
field2, 
field3, 
count(*) as field4, 
field5, 
field6,
case
when smt1>0 then 'Deleted'
when smt2>0 then 'Impacted'
when smt3>0 then 'Unknown'
else 'Clean'
end as field7, 
field8, 
field9, 
field10,
field11, 
field12, 
field13
from (<here a big sub query>) A
group by field1, field2, field3, field5, field6, field8, field9, field10, field11, field12, field13
order by field1, field2

如何在不改变查询的整体含义的情况下解决这个问题？

非常感谢,马丁

Answer 1

你field7的group by表达中缺少你.

此外,您不能通过表达相同的查询在组中使用别名.您需要CASE通过表达式在组中添加完整语句以包含field7.

只是在group by中提到别名是不可能的,因为该SELECT步骤是执行查询的最后一步,分组发生在早期,当别名尚未定义时.