[LeetCode] 176. Second Highest Salary

Posted on | In

Problem

Write a SQL query to get the second highest salary from the Employee table.

1
2
3
4
5
6
7
+----+--------+
| Id | Salary |
+----+--------+
| 1  | 100    |
| 2  | 200    |
| 3  | 300    |
+----+--------+

For example, given the above Employee table, the query should return 200 as the second highest salary. If there is no second highest salary, then the query should return null.

1
2
3
4
5
+---------------------+
| SecondHighestSalary |
+---------------------+
| 200                 |
+---------------------+

Explanation

  1. We can use MAX(Salary) to get the highest salary, then NOT IN or < than the MAX.

Solution

1
2
3
4
# Write your MySQL query statement below
SELECT MAX(Salary) AS SecondHighestSalary
FROM Employee
WHERE Salary < (SELECT MAX(Salary) FROM Employee);