Question

我与(emp_id,emp_name,salary)等属性有员工关系，我想找到每个员工的薪水和平均工资之间的差异。我正在使用SQL Plus。

即。每个salary-avg(salary)

Answer 1

试试这个。

SELECT a.emp_id,
       a.emp_name,
       a.salary,
       a.Designation,
      (a.salary - b.salary) as salary_difference 
FROM employee AS a
INNER JOIN (
  SELECT Designation, avg(salary) as salary
  from employee
  group by Designation) as b
ON a.Designation = b.Designation ;

SQL Fiddle HERE

Answer 2

这可以使用窗口函数来完成：

SELECT emp_id,
       emp_name,
       salary
       salary - avg(salary) over () as diff
FROM employee

如何解决这个查询找到差异？

2 个答案: