1.0 KiB
1.0 KiB
176.第二高的薪水
2021-07-16 10:48:18
SQL架构:
Create table If Not Exists Employee (Id int, Salary int);
Truncate table Employee;
insert into Employee (Id, Salary) values ('1', '100');
insert into Employee (Id, Salary) values ('2', '200');
insert into Employee (Id, Salary) values ('3', '300');
题
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 |
Related Topics 数据库
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解
SELECT
IFNULL(
(SELECT DISTINCT `Salary`
FROM `Employee`
ORDER BY `Salary` DESC
LIMIT 1 OFFSET 1),
NULL) AS SecondHighestSalary;