/* 标题:按某字段合并字符串之一(简单合并) 作者:爱新觉罗.毓华(十八年风雨,守得冰山雪莲花开) 时间:2008-11-06 地点:广东深圳描述:将如下形式的数据按id字段合并value字段。 id value ----- ------ 1 aa 1 bb 2 aaa 2 bbb 2 ccc 需要得到结果: id value ------ ----------- 1 aa,bb 2 aaa,bbb,ccc 即:group by id, 求 value 的和(字符串相加) */ --1、sql2000中只能用自定义的函数解决 create table tb(id int, value varchar(10)) insert into tb values(1, 'aa') insert into tb values(1, 'bb') insert into tb values(2, 'aaa') insert into tb values(2, 'bbb') insert into tb values(2, 'ccc') gocreate function dbo.f_str(@id varchar(10)) returns varchar(1000) as begin declare @str varchar(1000) select @str = isnull(@str + ',' , '') + cast(value as varchar) from tb where id = @id return @str end go--调用函数 select id , value = dbo.f_str(id) from tb group by iddrop function dbo.f_str drop table tb --2、sql2005中的方法 create table tb(id int, value varchar(10)) insert into tb values(1, 'aa') insert into tb values(1, 'bb') insert into tb values(2, 'aaa') insert into tb values(2, 'bbb') insert into tb values(2, 'ccc') goselect id, [value] = stuff((select ',' + [value] from tb t where id = tb.id for xml path('')) , 1 , 1 , '') from tb group by iddrop table tb --3、使用游标合并数据 create table tb(id int, value varchar(10)) insert into tb values(1, 'aa') insert into tb values(1, 'bb') insert into tb values(2, 'aaa') insert into tb values(2, 'bbb') insert into tb values(2, 'ccc') go declare @t table(id int,value varchar(100))--定义结果集表变量 --定义游标并进行合并处理 declare my_cursor cursor local for select id , value from tb declare @id_old int , @id int , @value varchar(10) , @s varchar(100) open my_cursor fetch my_cursor into @id , @value select @id_old = @id , @s='' while @@FETCH_STATUS = 0 begin if @id = @id_old select @s = @s + ',' + cast(@value as varchar) else begin insert @t values(@id_old , stuff(@s,1,1,'')) select @s = ',' + cast(@value as varchar) , @id_old = @id end fetch my_cursor into @id , @value END insert @t values(@id_old , stuff(@s,1,1,'')) close my_cursor deallocate my_cursorselect * from @t drop table tb
select types, dtext=stuff((select ','+dtext from Details where types=t.types for xml path('')),1,1,'') from Details t group by types
SELECT Types,Dtext=STUFF((SELECT ' '+Dtext FROM Details p WHERE p.Types=t.Types FOR XML PATH('')),1,1,'') FROM Details t GROUP BY Types
CREATE TABLE #TYEP ( ID INT IDENTITY, Types VARCHAR(10) )INSERT INTO #TYEP SELECT 'A1' INSERT INTO #TYEP SELECT 'A2' INSERT INTO #TYEP SELECT 'A3'CREATE TABLE #Details ( ID INT IDENTITY, Typeid INT, Dtext NVARCHAR(10) )INSERT INTO #Details SELECT 1,N'计算机' INSERT INTO #Details SELECT 1,N'外语' INSERT INTO #Details SELECT 1,N'数学' INSERT INTO #Details SELECT 2,N'体育' INSERT INTO #Details SELECT 2,N'艺术' INSERT INTO #Details SELECT 3,N'法律' INSERT INTO #Details SELECT 3,N'政治'SELECT P.Types,M.Dtext FROM ( SELECT TypeID,Dtext=STUFF((SELECT ','+Dtext FROM #Details p WHERE p.TypeID=t.TypeID FOR XML PATH('')),1,1,'') FROM #Details t GROUP BY TypeID )M LEFT JOIN #TYEP P ON M.TypeID=P.IDTypes Dtext ---------- ---------------------------- A1 计算机,外语,数学 A2 体育,艺术 A3 法律,政治(3 row(s) affected)
select Types,stuff((select ','+Dtext from Details as a where a.Types=Details .Types for xml path('')),1,1,'') from Details group by Types
--2、sql2005中的方法 CREATE TABLE tb2(id int, value varchar(10)) INSERT INTO tb2 VALUES(1, 'aa') INSERT INTO tb2 VALUES(1, 'bb') INSERT INTO tb2 VALUES(2, 'aaa') INSERT INTO tb2 VALUES(2, 'bbb') INSERT INTO tb2 VALUES(2, 'ccc') goSELECT id, [value] = STUFF((SELECT ',' + [value] FROM tb2 t WHERE id = tb2.id FOR xml path('')),1,1,'') FROM tb2 GROUP BY idDROP TABLE tb2 --出现问题,代码直接复制的 /* 消息 170,级别 15,状态 1,第 2 行 第 2 行: 'xml' 附近有语法错误。 */不明 刚装2005 求解~~!!
标题:按某字段合并字符串之一(简单合并)
作者:爱新觉罗.毓华(十八年风雨,守得冰山雪莲花开)
时间:2008-11-06
地点:广东深圳描述:将如下形式的数据按id字段合并value字段。
id value
----- ------
1 aa
1 bb
2 aaa
2 bbb
2 ccc
需要得到结果:
id value
------ -----------
1 aa,bb
2 aaa,bbb,ccc
即:group by id, 求 value 的和(字符串相加)
*/
--1、sql2000中只能用自定义的函数解决
create table tb(id int, value varchar(10))
insert into tb values(1, 'aa')
insert into tb values(1, 'bb')
insert into tb values(2, 'aaa')
insert into tb values(2, 'bbb')
insert into tb values(2, 'ccc')
gocreate function dbo.f_str(@id varchar(10)) returns varchar(1000)
as
begin
declare @str varchar(1000)
select @str = isnull(@str + ',' , '') + cast(value as varchar) from tb where id = @id
return @str
end
go--调用函数
select id , value = dbo.f_str(id) from tb group by iddrop function dbo.f_str
drop table tb
--2、sql2005中的方法
create table tb(id int, value varchar(10))
insert into tb values(1, 'aa')
insert into tb values(1, 'bb')
insert into tb values(2, 'aaa')
insert into tb values(2, 'bbb')
insert into tb values(2, 'ccc')
goselect id, [value] = stuff((select ',' + [value] from tb t where id = tb.id for xml path('')) , 1 , 1 , '')
from tb
group by iddrop table tb
--3、使用游标合并数据
create table tb(id int, value varchar(10))
insert into tb values(1, 'aa')
insert into tb values(1, 'bb')
insert into tb values(2, 'aaa')
insert into tb values(2, 'bbb')
insert into tb values(2, 'ccc')
go
declare @t table(id int,value varchar(100))--定义结果集表变量
--定义游标并进行合并处理
declare my_cursor cursor local for
select id , value from tb
declare @id_old int , @id int , @value varchar(10) , @s varchar(100)
open my_cursor
fetch my_cursor into @id , @value
select @id_old = @id , @s=''
while @@FETCH_STATUS = 0
begin
if @id = @id_old
select @s = @s + ',' + cast(@value as varchar)
else
begin
insert @t values(@id_old , stuff(@s,1,1,''))
select @s = ',' + cast(@value as varchar) , @id_old = @id
end
fetch my_cursor into @id , @value
END
insert @t values(@id_old , stuff(@s,1,1,''))
close my_cursor
deallocate my_cursorselect * from @t
drop table tb
types,
dtext=stuff((select ','+dtext from Details where types=t.types for xml path('')),1,1,'')
from
Details t
group by
types
WHERE p.Types=t.Types FOR XML PATH('')),1,1,'')
FROM Details t
GROUP BY Types
ID Types
1 A1
2 A2
3 A3
表2:详情表:Details
ID Typeid Dtext
1 1 计算机
2 1 外语
3 1 数学
4 2 体育
5 2 艺术
6 3 法律
7 3 政治
根据两张表,需要查询出的最终结果为:
Types Dtext
A1 计算机, 外语, 数学
A2 体育, 艺术
A3 法律, 政治
请问SQl语句该如何写????
(
ID INT IDENTITY,
Types VARCHAR(10)
)INSERT INTO #TYEP SELECT 'A1'
INSERT INTO #TYEP SELECT 'A2'
INSERT INTO #TYEP SELECT 'A3'CREATE TABLE #Details
(
ID INT IDENTITY,
Typeid INT,
Dtext NVARCHAR(10)
)INSERT INTO #Details SELECT 1,N'计算机'
INSERT INTO #Details SELECT 1,N'外语'
INSERT INTO #Details SELECT 1,N'数学'
INSERT INTO #Details SELECT 2,N'体育'
INSERT INTO #Details SELECT 2,N'艺术'
INSERT INTO #Details SELECT 3,N'法律'
INSERT INTO #Details SELECT 3,N'政治'SELECT P.Types,M.Dtext FROM
(
SELECT TypeID,Dtext=STUFF((SELECT ','+Dtext FROM #Details p
WHERE p.TypeID=t.TypeID
FOR XML PATH('')),1,1,'')
FROM #Details t GROUP BY TypeID
)M
LEFT JOIN #TYEP P
ON M.TypeID=P.IDTypes Dtext
---------- ----------------------------
A1 计算机,外语,数学
A2 体育,艺术
A3 法律,政治(3 row(s) affected)
select Types,stuff((select ','+Dtext from Details as a where a.Types=Details .Types for xml path('')),1,1,'')
from Details
group by Types
--2、sql2005中的方法
CREATE TABLE tb2(id int, value varchar(10))
INSERT INTO tb2 VALUES(1, 'aa')
INSERT INTO tb2 VALUES(1, 'bb')
INSERT INTO tb2 VALUES(2, 'aaa')
INSERT INTO tb2 VALUES(2, 'bbb')
INSERT INTO tb2 VALUES(2, 'ccc')
goSELECT id, [value] = STUFF((SELECT ',' + [value] FROM tb2 t WHERE id = tb2.id FOR xml path('')),1,1,'')
FROM tb2
GROUP BY idDROP TABLE tb2
--出现问题,代码直接复制的
/*
消息 170,级别 15,状态 1,第 2 行
第 2 行: 'xml' 附近有语法错误。
*/不明 刚装2005 求解~~!!