Second_Highest_Salary.sql

𝟏𝟕𝟔. 𝐒𝐞𝐜𝐨𝐧𝐝 𝐇𝐢𝐠𝐡𝐞𝐬𝐭 𝐒𝐚𝐥𝐚𝐫𝐲

Table: Employee

+-------------+------+
| Column Name | Type |
+-------------+------+
| id          | int  |
| salary      | int  |
+-------------+------+
id is the primary key (column with unique values) for this table.
Each row of this table contains information about the salary of an employee.
 

Write a solution to find the second highest distinct salary from the Employee table. If there is no second highest salary, return null (return None in Pandas).

The result format is in the following example.

 

Example 1:

Input: 
Employee table:
+----+--------+
| id | salary |
+----+--------+
| 1  | 100    |
| 2  | 200    |
| 3  | 300    |
+----+--------+
Output: 
+---------------------+
| SecondHighestSalary |
+---------------------+
| 200                 |
+---------------------+
Example 2:

Input: 
Employee table:
+----+--------+
| id | salary |
+----+--------+
| 1  | 100    |
+----+--------+
Output: 
+---------------------+
| SecondHighestSalary |
+---------------------+
| null                |
+---------------------+

Solution :

SELECT MAX(salary) AS SecondHighestSalary 
FROM Employee 
WHERE salary < (SELECT MAX(salary) FROM Employee);