Question

我正在学习数据库，我对查询有疑问：

我如何锻炼平均工资，包括总工资和工资差异？

我的表格如下：

Staff: staffNo(PK), staffSalary

我写的查询是

SELECT staffNo, staffSalary,staffSalary - ( 
SELECT AVG( staffSalary ) 
FROM Staff ) AS salDiff
FROM Staff
WHERE staffSalary > ( 
SELECT AVG( staffSalary ) 
FROM Staff )

此查询仅提供平均薪资差额和员工实际薪资，如何找出每个数据列的实际薪资平均值？在这个例子中也可以使用连接吗？

Answer 1

试试这个

SELECT staffNo, staffSalary,staffSalary - (SELECT AVG(staffSalary) FROM Staff ) AS salDiff,
                        (SELECT AVG(staffSalary) FROM Staff
                         WHERE staffSalary > (SELECT AVG(staffSalary) FROM Staff )) as avSalForStaffGreaterThanAverageSal
FROM Staff
WHERE staffSalary > (SELECT AVG(staffSalary) FROM Staff )

Answer 2

假设每位员工有一排，这就是我相信你要求的（对于所有高于平均水平的员工）：

select staffNo,
(Select avg(staffsalary) from staff) as avgSalary,
(select staffSalary from staff where staffNo = S.StaffNo) as Salary,
(Select staffSalary - (select avg(staffSalary) from staff) from staff where staffNo = S.staffNo ) as salDiff
from staff S
where staffSalary > (Select avg(staffSalary) from staff)

不确定为什么你需要加入...除非你想看到所有用户的工资，在这种情况下你可以简单地删除where子句，它会告诉你所有的工作人员。

SQL中的员工工资

2 个答案: