sql rank diplay请求的排名号

Question

查询：

SELECT distinct 
rank() OVER (ORDER BY p.service) as rank,
p.service, 
From table_service
Where 1=1

输出：
排名：1 |服务：test1
排名：2 |服务：test2
排名：3 |服务：test3

我如何仅显示2级？

我尝试了此方法，但没有用：

SELECT distinct 
rank() OVER (ORDER BY p.service) as rank,
p.service, 
From table_service
Where rank = 2

有什么主意吗？

Answer 1

您可以尝试使用子查询，因为where不能使用别名来做条件。

SELECT * FROM (
    SELECT 
        rank() OVER (ORDER BY p.service) as rank,
        p.service, 
    From table_service
) t1
where rank = 2

Answer 2

将您的查询放入子查询中

select *
from
(
SELECT distinct 
rank() OVER (ORDER BY p.service) as rank,
p.service, 
From table_service
) sub
Where rank = 2;

Answer 3

为什么使用等级？大多数数据库支持offset/fetch或类似的东西：

select p.service,
from table_service p
order by p.service
offset 1 fetch first 1 row only;