SQL：語法錯誤：爲了用ROW_NUMBER（）函數

Question

我有如下表Employee：

+----+--------+ 
| Id | Salary | 
+----+--------+ 
| 1 | 150 | 
| 2 | 290 | 
| 3 | 302 | 
+----+--------+ 

我使用下面的代碼來找到第二個薪水最高：

with t as 
(
    select 
     Salary, 
     row_number() over (order by Salary desc) as salary_ord 
    from 
     Employee 
) 
select Salary 
from t 
where salary_ord == 2 

然而，我收到一個錯誤：

SyntaxError: near 't as (
select Salary, row_number() over (order by Salary desc) as salary_ord'

我在這裏做錯了什麼？謝謝！

Answer 1

在SQL中，正確的比較運算符是=，而不是==。所以，這是您的查詢的ANSI SQL版本：

with t as (
     select Salary, row_number() over (order by Salary desc) as salary_ord 
     from Employee 
    ) 
select Salary 
from t 
where salary_ord = 2; 

然而，你的錯誤意味着你的數據庫不支持with或窗口功能。

Answer 2

在SQL Server中，

你可以這樣做：

select top 1 Salary 
from Employee 
order by Salary desc 
offset 1 row fetch next 1 row only