Question

我想从表中获取前10个数据，需要在外部查询中按升序排序。下面是查询的伪代码。除了使用表值函数之外还有哪些选项？

select * from (select top 10 tour_date from tourtable order by tour_date desc) order by tour_date asc

Answer 1

您写的查询应该有效，您只需要对子查询进行别名：

select * 
    from (select top 10 tour_date from tourtable order by tour_date desc) t 
    order by tour_date asc

另一种选择，假设SQL Server 2005 +：

SELECT t.tour_date
    FROM (SELECT tour_date, ROW_NUMBER() OVER(ORDER BY tour_date DESC) AS RowNum
              FROM tourtable) t
    WHERE t.RowNum <= 10
    ORDER BY t.tour_date ASC

也可以用CTE编写：

WITH cteRowNum AS (
    SELECT tour_date, ROW_NUMBER() OVER(ORDER BY tour_date DESC) AS RowNum
        FROM tourtable
)
SELECT tour_date
    FROM cteRowNum
    WHERE RowNum <= 10
    ORDER BY tour_date ASC

Answer 2

在非tsql上下文中测试：

select * from (select tour_date from tourable order by tour_date desc limit 10) a order by tour_date asc

按内联视图排序

2 个答案: