Question

现在我使用MS SQL Server 2008.我想知道是否可以选择同一组的顶级记录。我的表中有3个字段。这是我的表

ID      GroupNo     FieldOfInterest  
0001    G1                  Football  
0002    G2                  Football  
0003    G2                  Basketball
0004    G3                  Golf
0005    G3                  Swimming

我想从这张表中选择记录

ID      GroupNo             FieldOfInterest  
0001    G1                  Football  
0002    G2                  Football  
0004    G3                  Golf

我该怎么做？请帮帮我问候

Answer 1

SELECT t1.*
FROM table AS t1
INNER JOIN (
    SELECT MIN(ID) AS MinID
    FROM table
    GROUP BY GroupNo) AS t2
ON t1.id = t2.MinID

假设“最高记录”表示ID最小的记录，因为您尚未提供订单。

Answer 2

SELECT    ID,
          GroupNo,
          FieldOfInterest
FROM      YOUR_TABLE a,    
          (SELECT    MIN(ID) AS ID
           FROM      YOUR_TABLE 
           GROUP BY  GroupNo) b
WHERE    a.ID = b.ID;

在此，我猜top record您的意思是records with the smallest ID value。

Answer 3

SQL Server ROW_NUMBER（）函数可以为您解决此问题：

create table interests (
    ID  int,
    GroupNo varchar(2),
    FieldOfInterest varchar(20)
)

insert into interests
values (1, 'G1', 'Football'),
    (2, 'G2', 'Football'),
    (3, 'G2', 'Basketball'),
    (4, 'G3', 'Golf'),
    (5, 'G3', 'Swimming');

with cte as (
    select ROW_NUMBER() OVER (PARTITION BY GroupNo ORDER BY ID) as row, *
    from interests
)
select c.ID, c.GroupNo, c.FieldOfInterest
from cte c
where row = 1

如何选择同一组的最高记录？

3 个答案: