Firebird 无法识别 group by 子句中的计算列

Question

我有以下 SQL:

select
inv.salesman_id,
(select salesman_goals.goal from salesman_goals
    where salesman_goals.salesman_id = inv.salesman_id
    and salesman_goals.group_id = g.group_id
    and salesman_goals.subgroup_id = sg.subgroup_id
    and salesman_goals.variation_id = v.variation_id)
    as goal,
sum(i.quantity) as qnt
from invoiceitem i
inner join invoice inv on inv.invoice_id = i.invoice_id
inner join product p on p.product_id = i.product_id
left join groups g on g.group_id = p.group_id
left join subgroup sg on sg.group_id = g.group_id and sg.subgroup_id = p.subgroup_id
left join variation v on v.group_id = sg.group_id and v.subgroup_id = sg.subgroup_id and v.variation_id = p.variation_id
group by
1,2

其中returns三列，第一列是销售员id，第二列是子select获取销售量目标，第三列是实际销售量。即使按第一列和第二列分组，firebird 在执行查询时也会抛出错误：

Invalid expression in the select list (not contained in either an aggregate function or the GROUP BY clause). 这是什么原因？

Answer 1

有一列"in the select list (not contained in either an aggregate function or the GROUP BY clause)"。即除了 inv.salesman_id 之外，您在子选择中提到的每一列。这样的列每组有很多值。当有一个 GROUP BY（或只是一个 HAVING，按所有列隐式分组）时，一个 SELECT 子句 returns 每组一行。 return 没有单一值。所以你想要（当你自己回答时）：

group by
inv.salesman_id,
g.group_id,
sg.subgroup_id,
v.variation_id

Answer 2

好的，我找到了解决这个问题的方法。

问题是，如果您在 group by 子句中的列中有一个子查询，则此子查询中的参数也必须出现在 group by 中。所以在这种情况下，我所要做的就是：

group by
inv.salesman_id,
g.group_id,
sg.subgroup_id,
v.variation_id

就是这样。希望对以后遇到同样问题的人有所帮助。

Firebird 无法识别 group by 子句中的计算列

Firebird can't recognize calculated column in group by clause

sql

firebird