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 |
+---------------------+
Solution 1:
# Write your MySQL query statement below
SELECT max(Salary) AS SecondHighestSalary
FROM Employee
WHERE Salary < (SELECT max(Salary) FROM Employee)
Solution 2:
# Write your MySQL query statement below
SELECT
(
SELECT DISTINCT Salary
FROM Employee
ORDER BY Salary DESC
LIMIT 1 OFFSET 1
) AS SecondHighestSalary
Summary:
NULLis difficult to handle.- https://discuss.leetcode.com/topic/13286/based-on-count-and-easy-to-extend-to-n
LeetCode: 176. Second Highest Salary
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