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
ÀûÓÃSUM¡¢AVG¡¢COUNT¡¢COUNT(*)¡¢MAX ºÍ MINÊÇÎÞ·¨×öµ½µÄ¡£ÒòΪÕâЩ¶¼ÊǶÔÊýÖµµÄ¾ÛºÏ¡£²»¹ýÎÒÃÇ¿ÉÒÔͨ¹ý×Ô¶¨Ò庯ÊýµÄ·½Ê½À´½â¾öÕâ¸öÎÊÌâ¡£
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
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-- Version:
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