假设您正在使用MS SQL，那么它是非常基本的SQL。试试这个

  SELECT   TOP   3  SALARY 
 FROM  EMPLOYEE 
 ORDER   BY  SALARY  DESC  

检查这个...

如何在sql查询中获得前5名薪资数据 [ ^ ]

I have a table employee having salary column.

ID Salary
== ======
1  10000
2  10000
3  30000
4  20000
5  25000

now how to select top 3 salaries in a single query.

Well its quite basic SQL assuming you are using MS SQL. Try this

SELECT TOP 3 SALARY
FROM   EMPLOYEE
ORDER BY SALARY DESC

check this...
How to get top 5 salary data in sql query[^]