Question

使用排名功能查询第三高薪

select * 
from (
    select emp_sal,row_number()over() as RANK 
    from (
       select emp_sal 
       from emp_demo 
       order by emp_sal desc
    )
)K 
where K.RANK=3

错误

*ERROR:  subquery in FROM must have an alias
LINE 1: ...m (select emp_sal,row_number()over() as RANK from (select em...
                                                             ^
HINT:  For example, FROM (SELECT ...) [AS] foo.
********** Error **********
ERROR: subquery in FROM must have an alias
SQL state: 42601
Hint: For example, FROM (SELECT ...) [AS] foo.
Character: 63*

我无法在RazorSQL中显示第三高的薪水（也在Postgresql中）

Answer 1

您似乎错过了over子句的内容。此外，如果有几名员工拥有相同的工资，您应该使用dense_rank而不是row_number：

SELECT *
FROM   (SELECT *, DENSE_RANK() OVER (ORDER BY emp_sal DESC) AS rk 
        FROM   emp_demo) t
WHERE  rk = 3

Answer 2

以下作品

select *  from employee emp1 where (2) = (select count(distinct(emp2.salary))
         from employee emp2 where emp2.salary > emp1.salary )

当计数为0时，查询就像一个循环一样工作，它是最高的最大值。

当计数为1时，只有一个最大值大于当前值。因此应该是第二高的。

当计数为2时，有两个值大于当前值。所以应该是第三高。

替代

select distinct(salary) as salary from employee order by salary desc offset 2 limit 1

使用Postgres Sql中的rank函数获得第三高薪

2 个答案: