leetcode-176. Second Highest Salary

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Difficulty

Easy

Description

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

±—±-------+
| 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.

±--------------------+
| SecondHighestSalary |
±--------------------+
| 200 |
±--------------------+

Thinkings

SELECT MAX(Salary) SecondHighestSalary FROM Employee 
WHERE Salary NOT IN
(SELECT MAX(Salary) FROM Employee);

or

SELECT MAX(Salary) SecondHighestSalary FROM Employee
Where Salary <
(SELECT MAX(Salary) FROM Employee);