Question

我正在使用SQL Server 2008 R2。

我的数据库中three tables与many-to-many的关系如下所示。

TblServiceLevel     
Id  ServiceLevel    Code
1   C               1
2   R               1
3   V               1
4   R Test          4
5   C Test          4
6   S               2
7   K               3


TblUser 
Id  Name
1   A
2   B
3   C
4   D
5   E
6   F


TblUserServiceLevel         
Id  UserId  ServiceLevelId  Status
1   1       1               Active
2   1       1               Deactive
3   2       3               Active
4   3       4               Active
5   1       5               Active
6   5       1               Active
7   2       3               Deactive
8   3       4               Deactive
9   5       1               Deactive
10  2       3               Active
11  3       4               Active
12  4       1               Active

现在，

从这些表中，我想要TblUserServiceLevel和latest service level ="Active"中存在的不同用户拥有ServiceLevel.Code <> 4.和2

任何人都可以帮助我吗？

结果是4和{{1}}用户ID。

Answer 1

select t1.UserId
from TblUserServiceLevel t1
inner join (
    select UserId, max (Id) as maxId
    from TblUserServiceLevel
    group by UserId
) t2 on t1.UserId = t2.UserId and t1.Id = t2.maxId
inner join TblServiceLevel sl on t1.ServiceLevelId = sl.Id and sl.Code <> 4
where t1.Status = 'Active'

从多对多关系表中获取最新记录

1 个答案: