LeetCode-MySQL基础题之176(第二高的薪水)


编写一个 SQL 查询,获取 Employee 表中第二高的薪水(Salary)。

Id Salary
1 100
2 200
3 300

例如上述 Employee 表,SQL查询应该返回 200 作为第二高的薪水。如果不存在第二高的薪水,那么查询应返回 null。

SecondHighestSalary
200

对应的SQL查询语句如下:

IFNULL(field,Default) as alias 的使用方法

SELECT IFNULL((
        SELECT DISTINCT Salary
        FROM Employee
        ORDER BY Salary DESC
        LIMIT 1, 1
    ), NULL) AS SecondHighestSalary

SELECT DISTINCT Salary AS SecondHighestSalary
FROM Employee
ORDER BY Salary DESC
LIMIT 1, 1

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