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

返回三列，第一列是销售员ID，第二列是获取销售数量目标的子选择，第三列是实际销售数量。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

选择列表中有一列＆＃34;（未包含在聚合函数或GROUP BY子句中）＆＃34;。即您在子选择中提到的每个列，而不是inv.salesman_id。这样的列每组有许多值。当存在GROUP BY（或只是HAVING，由所有列隐式分组）时，SELECT子句每组返回一行。没有单一的价值可以返回。所以你想（当你自己回答）时：

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

Answer 2

好的家伙我找到了解决这个问题的方法。

问题是，如果列中的子查询位于group by子句中，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。希望将来有人遇到同样的问题会有所帮助。

Firebird无法识别group by子句中的计算列

2 个答案: