急！！在线等！高分诚心求助各位sql精英，一条sql汇总语句该如何写，有点难度，功力好的进！

[sonicryu]

手上有一个项目，现在要做一个对时间汇总的功能。要在一行里输出，每个文件的所有访问日期（不能重复）

希望请各位高人指点迷津


例如：

现有 表aaa


字段1 字段2

aaa 2009-03-05 01:00:00
aaa 2009-03-07 02:00:00
aaa 2009-03-08 03:00:00
aaa 2009-03-08 04:00:00

bbb 2009-03-11 01:00:00
bbb 2009-03-15 02:00:00
bbb 2009-03-15 03:00:00

ccc 2009-03-16 03:00:00


求一条sql语句，经查询后想要得到如下结果：（先取得时间的日期部分，然后输出日期到一个字段内，日期不能重复）

字段1 字段2

aaa 2009-03-05,2009-03-07,2009-03-08
bbb 2009-03-11,2009-03-15
ccc 2009-03-16

请教各位高人该如何实现？

[csdyyr]

SQL code问题描述：
无论是在sql 2000，还是在 sql 2005 中,都没有提供字符串的聚合函数，
  所以，当我们在处理下列要求时，会比较麻烦：
有表tb, 如下：
id    value
----- ------
1     aa
1     bb
2     aaa
2     bbb
2     ccc
需要得到结果：
id     values
------ -----------
1      aa,bb
2      aaa,bbb,ccc
即， group by id, 求 value 的和（字符串相加）

1. 旧的解决方法

-- 1. 创建处理函数
CREATE FUNCTION dbo.f_str(@id int)
RETURNS varchar(8000)
AS
BEGIN
    DECLARE @r varchar(8000)
    SET @r = ''
    SELECT @r = @r + ',' + value
    FROM tb
    WHERE id=@id
    RETURN STUFF(@r, 1, 1, '')
END
GO
-- 调用函数

SELECt id, values=dbo.f_str(id) 
FROM tb 
GROUP BY id

-- 2.1 新的解决方法 
-- 示例数据
DECLARE @t TABLE(id int, value varchar(10))
INSERT @t SELECT 1, 'aa'
UNION ALL SELECT 1, 'bb'
UNION ALL SELECT 2, 'aaa'
UNION ALL SELECT 2, 'bbb'
UNION ALL SELECT 2, 'ccc'

-- 查询处理
SELECT *
FROM(
    SELECT DISTINCT 
        id
    FROM @t
)A
OUTER APPLY(
    SELECT 
        [values]= STUFF(REPLACE(REPLACE(
            (
                SELECT value FROM @t N
                WHERE id = A.id
                FOR XML AUTO
            ), '<N value="', ','), '"/>', ''), 1, 1, '')
)N

/*--结果
id          values
----------- ----------------
1           aa,bb
2           aaa,bbb,ccc
(2 行受影响)
--*/
--2.2
DECLARE @TB TABLE([Name] VARCHAR(1), [Value] VARCHAR(6))
INSERT @TB 
SELECT 'A', '123' UNION ALL 
SELECT 'A', '677' UNION ALL 
SELECT 'B', 'HHDA' UNION ALL 
SELECT 'B', 'JYUKY' UNION ALL 
SELECT 'B', 'WRWFCW' UNION ALL 
SELECT 'B', 'YUYUY' UNION ALL 
SELECT 'C', 'TRREER'

SELECT [Name],STUFF((SELECT  ','+[Value] FROM @TB WHERE NAME=A.NAME FOR XML PATH('')),1,1,'') AS [Value]  
FROM @TB AS A
GROUP BY [Name]
/*
Name Value
---- ------------------------------------------
A    123,677
B    HHDA,JYUKY,WRWFCW,YUYUY
C    TRREER
*/

--各种字符串分函数

--3.3.1 使用游标法进行字符串合并处理的示例。
--处理的数据
CREATE TABLE tb(col1 varchar(10),col2 int)
INSERT tb SELECT 'a',1
UNION ALL SELECT 'a',2
UNION ALL SELECT 'b',1
UNION ALL SELECT 'b',2
UNION ALL SELECT 'b',3

--合并处理
--定义结果集表变量
DECLARE @t TABLE(col1 varchar(10),col2 varchar(100))

--定义游标并进行合并处理
DECLARE tb CURSOR LOCAL
FOR
SELECT col1,col2 FROM tb ORDER BY  col1,col2
DECLARE @col1_old varchar(10),@col1 varchar(10),@col2 int,@s varchar(100)
OPEN tb
FETCH tb INTO @col1,@col2
SELECT @col1_old=@col1,@s=''
WHILE @@FETCH_STATUS=0
BEGIN
    IF @col1=@col1_old
        SELECT @s=@s+','+CAST(@col2 as varchar)
    ELSE
    BEGIN
        INSERT @t VALUES(@col1_old,STUFF(@s,1,1,''))
        SELECT @s=','+CAST(@col2 as varchar),@col1_old=@col1
    END
    FETCH tb INTO @col1,@col2
END
INSERT @t VALUES(@col1_old,STUFF(@s,1,1,''))
CLOSE tb
DEALLOCATE tb
--显示结果并删除测试数据
SELECT * FROM @t
DROP TABLE tb
/*--结果
col1       col2
---------- -----------
a          1,2
b          1,2,3
--*/
GO


/*==============================================*/


--3.3.2 使用用户定义函数，配合SELECT处理完成字符串合并处理的示例
--处理的数据
CREATE TABLE tb(col1 varchar(10),col2 int)
INSERT tb SELECT 'a',1
UNION ALL SELECT 'a',2
UNION ALL SELECT 'b',1
UNION ALL SELECT 'b',2
UNION ALL SELECT 'b',3
GO

--合并处理函数
CREATE FUNCTION dbo.f_str(@col1 varchar(10))
RETURNS varchar(100)
AS
BEGIN
    DECLARE @re varchar(100)
    SET @re=''
    SELECT @re=@re+','+CAST(col2 as varchar)
    FROM tb
    WHERE col1=@col1
    RETURN(STUFF(@re,1,1,''))
END
GO

--调用函数
SELECT col1,col2=dbo.f_str(col1) FROM tb GROUP BY col1
--删除测试
DROP TABLE tb
DROP FUNCTION f_str
/*--结果
col1       col2
---------- -----------
a          1,2
b          1,2,3
--*/
GO

/*==============================================*/


--3.3.3 使用临时表实现字符串合并处理的示例
--处理的数据
CREATE TABLE tb(col1 varchar(10),col2 int)
INSERT tb SELECT 'a',1
UNION ALL SELECT 'a',2
UNION ALL SELECT 'b',1
UNION ALL SELECT 'b',2
UNION ALL SELECT 'b',3

--合并处理
SELECT col1,col2=CAST(col2 as varchar(100)) 
INTO #t FROM tb
ORDER BY col1,col2
DECLARE @col1 varchar(10),@col2 varchar(100)
UPDATE #t SET 
    @col2=CASE WHEN @col1=col1 THEN @col2+','+col2 ELSE col2 END,
    @col1=col1,
    col2=@col2
SELECT * FROM #t
/*--更新处理后的临时表
col1       col2
---------- -------------
a          1
a          1,2
b          1
b          1,2
b          1,2,3
--*/
--得到最终结果
SELECT col1,col2=MAX(col2) FROM #t GROUP BY col1
/*--结果
col1       col2
---------- -----------
a          1,2
b          1,2,3
--*/
--删除测试
DROP TABLE tb,#t
GO


/*==============================================*/

--3.3.4.1 每组 <=2 条记录的合并
--处理的数据
CREATE TABLE tb(col1 varchar(10),col2 int)
INSERT tb SELECT 'a',1
UNION ALL SELECT 'a',2
UNION ALL SELECT 'b',1
UNION ALL SELECT 'b',2
UNION ALL SELECT 'c',3

--合并处理
SELECT col1,
    col2=CAST(MIN(col2) as varchar)
        +CASE 
            WHEN COUNT(*)=1 THEN ''
            ELSE ','+CAST(MAX(col2) as varchar)
        END
FROM tb
GROUP BY col1
DROP TABLE tb
/*--结果
col1       col2      
---------- ----------
a          1,2
b          1,2
c          3
--*/

--3.3.4.2 每组 <=3 条记录的合并
--处理的数据
CREATE TABLE tb(col1 varchar(10),col2 int)
INSERT tb SELECT 'a',1
UNION ALL SELECT 'a',2
UNION ALL SELECT 'b',1
UNION ALL SELECT 'b',2
UNION ALL SELECT 'b',3
UNION ALL SELECT 'c',3

--合并处理
SELECT col1,
    col2=CAST(MIN(col2) as varchar)
        +CASE 
            WHEN COUNT(*)=3 THEN ','
                +CAST((SELECT col2 FROM tb WHERE col1=a.col1 AND col2 NOT IN(MAX(a.col2),MIN(a.col2))) as varchar)
            ELSE ''
        END
        +CASE 
            WHEN COUNT(*)>=2 THEN ','+CAST(MAX(col2) as varchar)
            ELSE ''
        END
FROM tb a
GROUP BY col1
DROP TABLE tb
/*--结果
col1       col2
---------- ------------
a          1,2
b          1,2,3
c          3
--*/
GO
if not object_id('A') is null
    drop table A
Go
Create table A([id] int,[cname] nvarchar(2))
Insert A
select 1,N'张三' union all
select 2,N'李四' union all
select 3,N'王五' union all
select 4,N'蔡六'
Go
--> --> 
 
if not object_id('B') is null
    drop table B
Go
Create table B([id] int,[cname] nvarchar(5))
Insert B
select 1,N'1,2,3' union all
select 2,N'3,4'
Go
create function F_str(@cname nvarchar(100))
returns nvarchar(100)
as
begin 
select @cname=replace(@cname,ID,[cname]) from A where patindex('%,'+rtrim(ID)+',%',','+@cname+',')>0
return @cname
end
go
select [id],dbo.F_str([cname])[cname] from B

id          cname
----------- ----------------------------------------------------------------------------------------------------
1           张三,李四,王五
2           王五,蔡六

(2 個資料列受到影響)

[feixianxxx]

CREATE FUNCTION dbo.f_tb(@id varchar) 
RETURNS varchar(8000) 
AS 
BEGIN 
    DECLARE @str varchar(8000) 
    SET @str = '' 
    SELECT @str = @str + ' ' + convert(varchar(10),字段2 FROM tb WHERE 字段1=@id 
    RETURN STUFF(@str, 1, 1, '') 
END 
GO 

SELECT 字段1, 字段2 = dbo.f_tb(字段1) FROM tb GROUP BY 字段1

[--小F--]

--参考
SQL code问题描述：
无论是在sql 2000，还是在 sql 2005 中,都没有提供字符串的聚合函数，
  所以，当我们在处理下列要求时，会比较麻烦：
有表tb, 如下：
id    value
----- ------
1     aa
1     bb
2     aaa
2     bbb
2     ccc
需要得到结果：
id     values
------ -----------
1      aa,bb
2      aaa,bbb,ccc
即， group by id, 求 value 的和（字符串相加）

1. 旧的解决方法

-- 1. 创建处理函数
CREATE FUNCTION dbo.f_str(@id int)
RETURNS varchar(8000)
AS
BEGIN
    DECLARE @r varchar(8000)
    SET @r = ''
    SELECT @r = @r + ',' + value
    FROM tb
    WHERE id=@id
    RETURN STUFF(@r, 1, 1, '')
END
GO
-- 调用函数

SELECt id, values=dbo.f_str(id) 
FROM tb 
GROUP BY id

-- 2. 新的解决方法 
-- 示例数据
DECLARE @t TABLE(id int, value varchar(10))
INSERT @t SELECT 1, 'aa'
UNION ALL SELECT 1, 'bb'
UNION ALL SELECT 2, 'aaa'
UNION ALL SELECT 2, 'bbb'
UNION ALL SELECT 2, 'ccc'

-- 查询处理
SELECT *
FROM(
    SELECT DISTINCT 
        id
    FROM @t
)A
OUTER APPLY(
    SELECT 
        [values]= STUFF(REPLACE(REPLACE(
            (
                SELECT value FROM @t N
                WHERE id = A.id
                FOR XML AUTO
            ), '<N value="', ','), '"/>', ''), 1, 1, '')
)N

/*--结果
id          values
----------- ----------------
1           aa,bb
2           aaa,bbb,ccc
(2 行受影响)
--*/

[csdyyr]

CREATE TABLE TB([字段1] VARCHAR(3), [字段2] DATETIME)
INSERT TB 
SELECT 'aaa', '2009-03-05 01:00:00' UNION ALL 
SELECT 'aaa', '2009-03-07 02:00:00' UNION ALL 
SELECT 'aaa', '2009-03-08 03:00:00' UNION ALL 
SELECT 'aaa', '2009-03-08 04:00:00' UNION ALL 
SELECT 'bbb', '2009-03-11 01:00:00' UNION ALL 
SELECT 'bbb', '2009-03-15 02:00:00' UNION ALL 
SELECT 'bbb', '2009-03-15 03:00:00' UNION ALL 
SELECT 'ccc', '2009-03-16 03:00:00'
GO
CREATE FUNCTION F_COMBINESTR(@ID VARCHAR(3))
RETURNS VARCHAR(100)
AS 
BEGIN
  DECLARE  @SQL VARCHAR(100)
  SET @SQL=''
  SELECT @SQL=@SQL+',' + [字段2]
  FROM (SELECT DISTINCT CONVERT(VARCHAR(10),[字段2],120) AS [字段2] FROM TB WHERE [字段1]=@ID) T
  RETURN STUFF(@SQL, 1, 1, '')
END
GO

SELECT [字段1],[字段2]=dbo.F_COMBINESTR([字段1]) FROM TB GROUP BY [字段1]

DROP TABLE TB
DROP FUNCTION F_COMBINESTR
/*
字段1  字段2
---- ----------------------------------------------------------------------------------------------------
aaa  2009-03-05,2009-03-07,2009-03-08
bbb  2009-03-11,2009-03-15
ccc  2009-03-16

*/

[feixianxxx]

create table tb (字段1 char(3),字段2 datetime)
insert tb
select 'aaa','2009-03-05 01:00:00' union all
select 'aaa','2009-03-07 02:00:00' union all
select 'aaa','2009-03-08 03:00:00' union all
select 'bbb','2009-03-08 04:00:00' union all
select 'bbb','2009-03-11 01:00:00' union all
select 'bbb','2009-03-15 01:00:00' union all
select 'bbb','2009-03-05 02:00:00' union all
select 'ccc','2009-03-016 01:00:00' 

go
CREATE FUNCTION dbo.f_tb(@id char(3)) 
RETURNS varchar(8000) 
AS 
BEGIN 
    DECLARE @str varchar(8000) 
    SET @str = '' 
    SELECT @str = @str + ',' + convert(varchar(10),字段2,120) FROM tb WHERE 字段1=@id 
    RETURN STUFF(@str, 1, 1, '') 
END 
GO 
SELECT 字段1, 字段2 = dbo.f_tb(字段1) FROM tb GROUP BY 字段1
drop table tb 
drop function dbo.f_tb 
/*
aaa	2009-03-05,2009-03-07,2009-03-08
bbb	2009-03-08,2009-03-11,2009-03-15,2009-03-05
ccc	2009-03-16
*/

[feixianxxx]

[Quote=引用 2 楼 feixianxxx 的回复:]
SQL codeCREATE FUNCTION dbo.f_tb(@id varchar)
RETURNS varchar(8000)
AS
BEGIN
DECLARE @str varchar(8000)
SET @str = ''
SELECT @str = @str + ' ' + convert(varchar(10),字段2 FROM tb WHERE 字段1=@id 2
RETURN STUFF(@str, 1, 1, '')
END
GO

SELECT 字段1, 字段2 = dbo.f_tb(字段1) FROM tb GROUP BY 字段1
[/Quote]
这里的小小哦错误在5楼改了 呵呵

[csdyyr]

--一条SQL,SQL 2005
CREATE TABLE TB([字段1] VARCHAR(3), [字段2] DATETIME)
INSERT TB 
SELECT 'aaa', '2009-03-05 01:00:00' UNION ALL 
SELECT 'aaa', '2009-03-07 02:00:00' UNION ALL 
SELECT 'aaa', '2009-03-08 03:00:00' UNION ALL 
SELECT 'aaa', '2009-03-08 04:00:00' UNION ALL 
SELECT 'bbb', '2009-03-11 01:00:00' UNION ALL 
SELECT 'bbb', '2009-03-15 02:00:00' UNION ALL 
SELECT 'bbb', '2009-03-15 03:00:00' UNION ALL 
SELECT 'ccc', '2009-03-16 03:00:00'
GO
SELECT [字段1],STUFF((SELECT  DISTINCT ','+CONVERT(VARCHAR(10),[字段2],120) FROM TB WHERE [字段1]=A.[字段1] FOR XML PATH('')),1,1,'') AS [字段2]  
FROM TB AS A
GROUP BY [字段1]

DROP TABLE TB

/*
字段1  字段2
---- ----------------------------------------------------------------------------------------------------
aaa  2009-03-05,2009-03-07,2009-03-08
bbb  2009-03-11,2009-03-15
ccc  2009-03-16

*/

[xiequan2]

declare @tb table  (字段1 char(3),字段2 datetime)
insert @tb
select 'aaa','2009-03-05 01:00:00' union all
select 'aaa','2009-03-07 02:00:00' union all
select 'aaa','2009-03-08 03:00:00' union all
select 'bbb','2009-03-08 04:00:00' union all
select 'bbb','2009-03-11 01:00:00' union all
select 'bbb','2009-03-15 01:00:00' union all
select 'bbb','2009-03-05 02:00:00' union all
select 'ccc','2009-03-016 01:00:00' 


select 字段1,stuff((select ','+Convert(varchar(10),字段2,120) from @tb where 字段1=a.字段1 for xml path('')),1,1,'') 字段2 from @tb a group by 字段1

/*
字段1  字段2
---- ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
aaa  2009-03-05,2009-03-07,2009-03-08
bbb  2009-03-08,2009-03-11,2009-03-15,2009-03-05
ccc  2009-03-16

(3 行受影响)

*/

[--小F--]

----------------------------------------------------------------
-- Author :fredrickhu(小F 向高手学习)
-- Date   :2009-06-23 14:45:12
----------------------------------------------------------------
--> 测试数据：[aaa]
if object_id('[aaa]') is not null drop table [aaa]
create table [aaa]([字段1] varchar(3),[字段2] datetime)
insert [aaa]
select 'aaa','2009-03-05 01:00:00' union all
select 'aaa','2009-03-07 02:00:00' union all
select 'aaa','2009-03-08 03:00:00' union all
select 'aaa','2009-03-08 04:00:00' union all
select 'bbb','2009-03-11 01:00:00' union all
select 'bbb','2009-03-15 02:00:00' union all
select 'bbb','2009-03-15 03:00:00' union all
select 'ccc','2009-03-16 03:00:00'
--------------开始查询--------------------------
CREATE FUNCTION dbo.f_tb(@id char(3)) 
RETURNS varchar(8000) 
AS 
BEGIN 
    DECLARE @str varchar(8000) 
    SET @str = '' 
    SELECT @str = @str + ',' + convert(varchar(10),字段2,120) FROM aaa WHERE 字段1=@id 
    RETURN STUFF(@str, 1, 1, '') 
END 
GO 
-- 调用函数
SELECT 字段1, 字段2 = dbo.f_tb(字段1) FROM aaa GROUP BY 字段1
drop table aaa 
drop function dbo.f_tb
----------------结果----------------------------
/*
字段1  字段2
aaa  2009-03-05,2009-03-07,2009-03-08
bbb  2009-03-11,2009-03-15
ccc  2009-03-16
*/

[--小F--]

--2005用XML
----------------------------------------------------------------
-- Author :fredrickhu(小F 向高手学习)
-- Date   :2009-06-23 14:45:12
----------------------------------------------------------------
--> 测试数据：[aaa]
if object_id('[aaa]') is not null drop table [aaa]
create table [aaa]([字段1] varchar(3),[字段2] datetime)
insert [aaa]
select 'aaa','2009-03-05 01:00:00' union all
select 'aaa','2009-03-07 02:00:00' union all
select 'aaa','2009-03-08 03:00:00' union all
select 'aaa','2009-03-08 04:00:00' union all
select 'bbb','2009-03-11 01:00:00' union all
select 'bbb','2009-03-15 02:00:00' union all
select 'bbb','2009-03-15 03:00:00' union all
select 'ccc','2009-03-16 03:00:00'
--------------开始查询--------------------------
select 字段1,stuff((select ','+Convert(varchar(10),字段2,120) from aaa where 字段1=a.字段1 for xml path('')),1,1,'') 字段2 from aaa a group by 字段1
----------------结果----------------------------
/*
字段1  字段2
aaa  2009-03-05,2009-03-07,2009-03-08
bbb  2009-03-11,2009-03-15
ccc  2009-03-16
*/

[usher_gml]

--以上的都不对,.都有重复日期2009-03-08


if object_id('[aaa]') is not null drop table [aaa]
create table [aaa]([字段1] varchar(3),[字段2] datetime)
insert [aaa]
select 'aaa','2009-03-05 01:00:00' union all
select 'aaa','2009-03-07 02:00:00' union all
select 'aaa','2009-03-08 03:00:00' union all
select 'aaa','2009-03-08 04:00:00' union all
select 'bbb','2009-03-11 01:00:00' union all
select 'bbb','2009-03-15 02:00:00' union all
select 'bbb','2009-03-15 03:00:00' union all
select 'ccc','2009-03-16 03:00:00'
go

--select distinct [字段1],left([字段2],10) from [aaa]
--go
CREATE FUNCTION dbo.f_tb(@id char(3)) 
RETURNS varchar(8000) 
AS 
BEGIN 
    DECLARE @str varchar(8000) 
    SET @str = '' 
    SELECT @str = @str + ',' + convert(varchar(10),字段2,120) 
    FROM (select distinct [字段1],left([字段2],10) [字段2] from [aaa]) tb WHERE 字段1=@id 
    RETURN STUFF(@str, 1, 1, '') 
END 
GO 
-- 调用函数
SELECT 字段1, 字段2 = dbo.f_tb(字段1) FROM (select distinct [字段1],left([字段2],10) [字段2] from [aaa])tb GROUP BY 字段1
drop table aaa 
drop function dbo.f_tb

[chenyukuai]

create TABLE t(id int, value varchar(10))
INSERT t SELECT 1, 'aa'
UNION ALL SELECT 1, 'bb'
UNION ALL SELECT 2, 'aaa'
UNION ALL SELECT 2, 'bbb'
UNION ALL SELECT 2, 'ccc'
UNION ALL SELECT 1, 'bb'
UNION ALL SELECT 2, 'aaa'
UNION ALL SELECT 2, 'bbb'
UNION ALL SELECT 2, 'ccc'
go
create FUNCTION dbo.f_str(@id int)
RETURNS varchar(8000)
AS
BEGIN
DECLARE @r varchar(8000)
SET @r = ''
SELECT @r = @r + ',' + b.value
FROM (select distinct value from t where id=@id) b
RETURN STUFF(@r, 1, 1, '')
END
GO
-- 调用函数

SELECt id, value=dbo.f_str(id)
FROM t
GROUP BY id
drop table t
drop function f_str