我有这张桌子:
serviceID Name L_name
--------------------------------
1 A B
2 A B
3 C D
4 E F
我想得到每个人得到的服务数量:
Name L_Name Countf
---------------------------------
A B 2
C D 1
E F 1
这是我写的一个查询,但没有正确的结果集:
select *
from
(Select Name,L_Name,COUNT(Service_ID) as 'countf'
from Service_Tbl
group by Name,L_Name) as tbl
我明白了:
Name L_Name Countf
---------------------------------
A B 1
A B 1
C D 1
E F 1
答案 0 :(得分:1)
您需要group
这样的结果:
select Name, L_Name, COUNT(Service_ID) as 'countf'
from Service_Tbl
group by Name,L_Name
这是一个提供所需结果的完整示例:
create table #Service_Tbl (
serviceID int,
Name varchar(1),
L_name varchar(1)
)
insert into #Service_Tbl values (1, 'A','B')
insert into #Service_Tbl values (2, 'A','B')
insert into #Service_Tbl values (3, 'C','D')
insert into #Service_Tbl values (4, 'E','F')
select Name, L_Name, COUNT(ServiceID) as 'countf'
from #Service_Tbl
group by Name,L_Name
drop table #Service_Tbl