Question

我有一个包含ID，Title，Date

的表模式

和数据看起来像这样：

1  The title1    2011-04-05 00:00:00.000
2  Another title 2011-04-11 00:00:00.000
3  The title1    2011-04-11 16:49:23.633
4  The title1    2011-04-11 00:00:00.000

我需要帮助sql给我每个标题的最新日期。所以上述数据的输出是

2  Another title 2011-04-11 00:00:00.000
3  The title1    2011-04-11 16:49:23.633

Answer 1

select id,title,date from [schema]
where title in (select title from [schema] group by title having date=max(date))

试试这个

Answer 2

在线图书中查看Max和group by

Answer 3

select mytable.Title, MAX(mytable.Date)
from mytable
group by mytable.Title

Answer 4

看看包含Aggregated Column's Related Values，有几种方法可以实现这个目标

一种方法是

select t1.* from(
select Title, Max(Date) as MaxDate
From YourTable
group by Title) t2
join YourTable t1 on t2.Title = t1.Title
and t1.Date = t2.MaxDAte

Answer 5

假设您的表名为mytable：

select 
  tbl.ID, tbl.Title, tbl.Date
from 
  mytable tbl join
  (select Title, max(Date) Date
   from mytable) maxes on tbl.Date = maxes.Date and tbl.Title = maxes.Title

Answer 6

至少假设SQL Server 2005：

SELECT ID, Title, [Date]
    FROM (SELECT ID, Title, [Date],
                 ROW_NUMBER() OVER(PARTITION BY Title ORDER BY [Date] DESC) AS RowNum
              FROM YourTable
         ) t
    WHERE t.RowNum = 1

仅选择最新版本的字段

6 个答案: