176. Second Highest Salary
2017-08-29 10:26
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题目:
找出工资第二高的工资数。表
Employee.
Id | Salary |
---|---|
1 | 100 |
2 | 200 |
3 | 300 |
SecondHighestSalary |
---|
200 |
解析:
找出次高值,我们很容易联想到,找出元素中的最大值(利用内函数max())。但是并没有函数可以直接找到次高值,因此可以max来找到次高值。在小于最大值的条件下,再次寻找一个最大值,那么该值就是次高值。
select max(salary) as SecondHighestSalary from Employee where salary<(select max(salary) from Employee)
利用
(select max(salary) from Employee)找出最大值,并作为条件,小与该值再次寻找最大值,输出即为次高值。
住:一定要写
as SecondHighestSalary,因为最后输出表头为
SecondHighestSalary。
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