Sql Server ×Ö·û´®¾ÛºÏº¯Êý

 Sql Server ÓÐÈçϼ¸Ö־ۺϺ¯ÊýSUM¡¢AVG¡¢COUNT¡¢COUNT(*)¡¢MAX ºÍ MIN£¬µ«ÊÇÕâЩº¯Êý¶¼Ö»ÄܾۺÏÊýÖµÀàÐÍ£¬ÎÞ·¨¾ÛºÏ×Ö·û´®¡£Èçϱí:AggregationTable
Id Name
1 ÕÔ
2 Ç®
1 Ëï
1 Àî
2 ÖÜ
Èç¹ûÏëµÃµ½ÏÂͼµÄ¾ÛºÏ½á¹û
Id Name
1 ÕÔËïÀî
2 Ç®ÖÜ
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1.Ê×ÏȽ¨Á¢²âÊÔ±í£¬²¢²åÈë²âÊÔÊý¾Ý£º
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create table AggregationTable(Id int, [Name] varchar(10))  
go  
insert into AggregationTable  
    select 1,'ÕÔ' union all  
    select 2,'Ç®' union all  
    select 1,'Ëï' union all  
    select 1,'Àî' union all  
    select 2,'ÖÜ' 
go 
create table AggregationTable(Id int, [Name] varchar(10))
go
insert into AggregationTable
 select 1,'ÕÔ' union all
 select 2,'Ç®' union all
 select 1,'Ëï' union all
 select 1,'Àî' union all
 select 2,'ÖÜ'
go
2.´´½¨×Ô¶¨Òå×Ö·û´®¾ÛºÏº¯Êý
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Create FUNCTION AggregateString  
(  
    @Id int 
)  
RETURNS varchar(1024)  
AS  
BEGIN  
    declare @Str varchar(1024)  
    set @Str = '' 
    select @Str = @Str + [Name] from AggregationTable  
    where [Id] = @Id  
    return @Str  
END  
GO 
Create FUNCTION AggregateString
(
 @Id int
)
RETURNS varchar(1024)
AS
BEGIN
 declare @Str varchar(1024)
 set @Str = ''
 select @Str = @Str + [Name] from AggregationTable
 where [Id] = @Id
 return @Str
END
GO
3.Ö´ÐÐÏÂÃæµÄÓï¾ä£¬²¢²é¿´½á¹û
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select dbo.Aggregate