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可能重复:
SQL中的GROUP BY /聚合函数混淆

我收到了一个错误 -

列'Employee.EmpID'在选择列表中无效,因为它不包含在聚合函数或GROUP BY子句中.

select loc.LocationID, emp.EmpID
from Employee as emp full join Location as loc 
on emp.LocationID = loc.LocationID
group by loc.LocationID 

这种情况符合Bill Karwin给出的答案.

修正以上,适合ExactaBox的答案 -

select loc.LocationID, count(emp.EmpID) -- not count(*), don't want to count nulls
from Employee as emp full join Location as loc 
on emp.LocationID = loc.LocationID
group by loc.LocationID 

原始问题 -

对于SQL查询 -

select *
from Employee as emp full join Location as loc 
on emp.LocationID = loc.LocationID
group by (loc.LocationID) …