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Most people do not understand the knowledge points of this article "what is the method of SQL search in the top three", so the editor summarizes the following content, detailed content, clear steps, and has a certain reference value. I hope you can get something after reading this article. Let's take a look at this article "what is the method of SQL search in the top three".

The specific data and SQL are like this.

WITH Employee AS (

SELECT 1 Id, 'joe' Name,70000 SALARY,1 DepartmentId FROM DUAL UNION ALL

SELECT 2 Id, 'Henry' Name,80000 SALARY,2 DepartmentId FROM DUAL UNION ALL

SELECT 3 Id, 'Sam' Name,60000 SALARY,2 DepartmentId FROM DUAL UNION ALL

SELECT 4 Id, 'Max' Name,90000 SALARY,1 DepartmentId FROM DUAL UNION ALL

SELECT 5 Id, 'Janet' Name,69000 SALARY,1 DepartmentId FROM DUAL UNION ALL

SELECT 6 Id, 'Randy' Name,85000 SALARY,1 DepartmentId FROM DUAL

),

Department AS (

SELECT 1 Id, 'IT' Name FROM DUAL UNION ALL

SELECT 2 Id, 'Sales' Name FROM DUAL

)

SELECT T1.namename T2.*

FROM

Department T1

, Employee T2

WHERE T1.ID = T2.DepartmentId

AND 3 >

(

SELECT COUNT (distinct T3.SALARY) RN

FROM Employee T3

WHERE T2.DepartmentId = T3.DepartmentId

AND T2.SALARY < T3.SALARY

)

ORDER BY T2.DEPARTMENTID,T2.SALARY

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