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name  score
 aaa   11
 aaa   19
 bbb   12
 bbb   18
 ccc   19
 ddd   21
ÆÚÍû²éѯ½á¹ûÈçÏÂ
name   score
 aaa     30
 bbb     30
 ccc      19
 ddd     21
Sql´úÂë
---¼ì²é±íÊÇ·ñ´æÔÚ   
if exists(select * from sysobjects where name='testSum')   
drop table testSum   
go   
---´´½¨±í   
create table testSum   
(   
   tid int primary key identity(1,1),   
   tname varchar(30) null,   
   tscor int null  
)   
go   
insert into testSum (tname,tscor)    
select 'aaa',11   
union all    
select 'aaa',19   
union all    
select 'bbb',12   
union all  
select 'bbb',18   
union all  
select 'ccc',19   
union all    
select 'ddd',21   
---²éѯÓï¾ä   
select tname ,sum(tscor) from testSum group by tname   
  
---Ö»²éѯtscor×ܺÍΪ30µÄ   
 select tname ,sum(tscor) from testSum group by tname having sum(tscor)=30  
---¼ì²é±íÊÇ·ñ´æÔÚ
if exists(select * from sysobjects where name='testSum')
drop table testSum
go
---´´½¨±í
create table testSum
(
tid int primary key identity(1,1),
tname varchar(30) null,
tscor int null
)
go
insert into testSum (tname,tscor)
select 'aaa',11
union all
select 'aaa',19
union


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