sql - ORA-00979: 不是 GROUP BY 表达式问题

Question

我正在执行以下请求，并收到“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？

非常感谢你，马丁

Answer 1

you are missing field7 in your group by expression.

Also you cannot use alias in your group by expression of same query. You need to add complete CASE statement in your group by expression to include field7.

Just mentioning an alias is not possible in group by, because the SELECT step is the last step to happen the execution of a query, grouping happens earlier, when alias names are not yet defined.

Answer 2

You need to add the expression

case
when smt1>0 then 'Deleted'
when smt2>0 then 'Impacted'
when smt3>0 then 'Unknown'
else 'Clean'
end

into your group by expression.