【Leetcode】176. Second Highest Salary （Easy）
1.題目
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 | +---------------------+翻譯：找到一張表中，第二大的值標記為SecondHighestSalary，如果沒有則返回null。
2.思路
小於最大Salary的最大Salary即為第二大的Salary值
3.演算法
select MAX(Salary) as SecondHighestSalary from Employee where Salary<(select MAX(Salary) from Employee)
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