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176. Second Highest Salary
Easy
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 |
+---------------------+
返回第二大的工资,ORDER BY之后LIMIT 1, 1 但题目还要求如果没有第二大要返回null,官方题解是在SELECT后边用SELECT建一个临时表,查不到相应数据就会返回null
# Write your MySQL query statement below
SELECT
(SELECT DISTINCT Salary
FROM Employee
ORDER BY Salary DESC
LIMIT 1,1) AS SecondHighestSalary;