declare @t table(number int,status char(17),sums int)
insert into @t(number,status,sums) values(1,'N',20)
insert into @t(number,status,sums) values(1,'Y',30)
insert into @t(number,status,sums) values(2,'Y',10)
insert into @t(number,status,sums) values(2,'Y',33)
SELECT
number as 编号,
((CASE WHEN EXISTS(SELECT 1 FROM @t WHERE number=t.number AND status='N') THEN 'N' ELSE 'Y' END) as zc) t,
SUM(sums) AS 数量
FROM t
GROUP BY number
第 8 行: 't' 附近有语法错误。
但我不知道有什么问题
declare @T table(userid int,username varchar(50),usercity varchar(50))
insert into @T (userid,username,usercity) values(1,'a','shangh')
insert into @T (userid,username,usercity) values(2,'b','beijing')
insert into @T (userid,username,usercity) values(3,'c','shangh')
insert into @T (userid,username,usercity) values(4,'d','beijing')
SELECT B.cityname,UserList FROM (
SELECT cityname,
(SELECT username+',' FROM @T WHERE cityname=A.cityname
FOR XML PATH('')) AS UserList
FROM @T A
GROUP BY cityname
) B
也是执行有误,但我不知道怎么改,希望高手帮忙
insert into @t(number,status,sums) values(1,'N',20)
insert into @t(number,status,sums) values(1,'Y',30)
insert into @t(number,status,sums) values(2,'Y',10)
insert into @t(number,status,sums) values(2,'Y',33)
SELECT
number as 编号,
((CASE WHEN EXISTS(SELECT 1 FROM @t WHERE number=t.number AND status='N') THEN 'N' ELSE 'Y' END) as zc) t,
SUM(sums) AS 数量
FROM t
GROUP BY number
第 8 行: 't' 附近有语法错误。
但我不知道有什么问题
declare @T table(userid int,username varchar(50),usercity varchar(50))
insert into @T (userid,username,usercity) values(1,'a','shangh')
insert into @T (userid,username,usercity) values(2,'b','beijing')
insert into @T (userid,username,usercity) values(3,'c','shangh')
insert into @T (userid,username,usercity) values(4,'d','beijing')
SELECT B.cityname,UserList FROM (
SELECT cityname,
(SELECT username+',' FROM @T WHERE cityname=A.cityname
FOR XML PATH('')) AS UserList
FROM @T A
GROUP BY cityname
) B
也是执行有误,但我不知道怎么改,希望高手帮忙
--第一个
declare @t table(number int,status char(17),sums int)
insert into @t(number,status,sums) values(1,'N',20)
insert into @t(number,status,sums) values(1,'Y',30)
insert into @t(number,status,sums) values(2,'Y',10)
insert into @t(number,status,sums) values(2,'Y',33)
SELECT
number as 编号,
(CASE WHEN EXISTS(SELECT 1 FROM @t WHERE number=t.number AND status='N') THEN 'N' ELSE 'Y' END) as zc,
SUM(sums) AS 数量
FROM @t as t
GROUP BY number
beijing b,d
number as 编号,
(CASE WHEN EXISTS(SELECT 1 FROM @t WHERE number=t.number AND status='N') THEN 'N' ELSE 'Y' END) as zc,
SUM(sums) AS 数量
FROM @t
GROUP BY number
-- 第二个这样可以运行,你有个cityname列不存在
declare @T table(userid int,username varchar(50),usercity varchar(50))
insert into @T (userid,username,usercity) values(1,'a','shangh')
insert into @T (userid,username,usercity) values(2,'b','beijing')
insert into @T (userid,username,usercity) values(3,'c','shangh')
insert into @T (userid,username,usercity) values(4,'d','beijing')
SELECT B.usercity,UserList FROM (
SELECT usercity,
(SELECT usercity+',' FROM @T WHERE usercity=A.usercity
FOR XML PATH('')) AS UserList
FROM @T A
GROUP BY usercity
) B
insert into @t(number,status,sums) values(1,'N',20)
insert into @t(number,status,sums) values(1,'Y',30)
insert into @t(number,status,sums) values(2,'Y',10)
insert into @t(number,status,sums) values(2,'Y',33) SELECT
number as 编号,
(CASE WHEN EXISTS(SELECT 1 FROM @t WHERE number=t.number AND status='N') THEN 'N' ELSE 'Y' END) as zc,
SUM(sums) AS 数量
FROM @t T
GROUP BY number (所影响的行数为 1 行)
(所影响的行数为 1 行)
(所影响的行数为 1 行)
(所影响的行数为 1 行)编号 zc 数量
----------- ---- -----------
1 N 50
2 Y 43(所影响的行数为 2 行)??
--合并列值
--原著:邹建
--改编:爱新觉罗.毓华(十八年风雨,守得冰山雪莲花开) 2007-12-16 广东深圳--表结构,数据如下:
/*
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(在sql server 2000中只能用函数解决。)
--1. 创建处理函数
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 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, value = dbo.f_str(id) FROM tb GROUP BY id drop table tb
drop function dbo.f_str /*
id value
----------- -----------
1 aa,bb
2 aaa,bbb,ccc
(所影响的行数为2 行)
*/ --2、另外一种函数.
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 --创建一个合并的函数
create function f_hb(@id int)
returns varchar(8000)
as
begin
declare @str varchar(8000)
set @str = ''
select @str = @str + ',' + cast(value as varchar) from tb where id = @id
set @str = right(@str , len(@str) - 1)
return(@str)
End
go --调用自定义函数得到结果:
select distinct id ,dbo.f_hb(id) as value from tb drop table tb
drop function dbo.f_hb /*
id value
----------- -----------
1 aa,bb
2 aaa,bbb,ccc
(所影响的行数为2 行)
*/ --2. 新的解决方法(在sql server 2005中用OUTER APPLY等解决。)
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')
go
-- 查询处理
select * from(select distinct id from tb)a outer apply(
select [values]= stuff(replace(replace(
(
select value from tb n
where id = a.id
for xml auto
), ' <N value="', ','), '"/>', ''), 1, 1, '')
)N
drop table tb /*
id values
----------- -----------
1 aa,bb
2 aaa,bbb,ccc (2 行受影响)
*/ --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')
go select id, [values]=stuff((select ','+[value] from tb t where id=tb.id for xml path('')), 1, 1, '')
from tb
group by id /*
id values
----------- --------------------
1 aa,bb
2 aaa,bbb,ccc (2 row(s) affected) */ drop table tb
服务器: 消息 170,级别 15,状态 1,行 9
第 9 行: 'XML' 附近有语法错误。
--1. 旧的解决方法(在sql server 2000中只能用函数解决。)
--1. 创建处理函数
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 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, value = dbo.f_str(id) FROM tb GROUP BY id drop table tb
drop function dbo.f_str /*
id value
----------- -----------
1 aa,bb
2 aaa,bbb,ccc
(所影响的行数为2 行)
*/
declare @T table(userid int,username varchar(50),usercity varchar(50))
insert into @T (userid,username,usercity) values(1,'a','shangh')
insert into @T (userid,username,usercity) values(2,'b','beijing')
insert into @T (userid,username,usercity) values(3,'c','shangh')
insert into @T (userid,username,usercity) values(4,'d','beijing') select usercity ,
case when count(1) = 2 then min(username) + ','+ max(username)
else min(username) end as username
from @T
group by usercity
-------------------------
beijing b,d
shangh a,c
declare @t table(number int,status char(17),sums int)
insert into @t(number,status,sums) values(1,'N',20)
insert into @t(number,status,sums) values(1,'Y',30)
insert into @t(number,status,sums) values(2,'Y',10)
insert into @t(number,status,sums) values(2,'Y',33) SELECT number as 编号,
(CASE WHEN EXISTS(SELECT 1 FROM @t WHERE number=t.number AND status='N') THEN 'N' ELSE 'Y' END) as zc,
SUM(sums) AS 数量
FROM @t AS t
GROUP BY number go
declare @T table(userid int,username varchar(50),usercity varchar(50))
insert into @T (userid,username,usercity) values(1,'a','shangh')
insert into @T (userid,username,usercity) values(2,'b','beijing')
insert into @T (userid,username,usercity) values(3,'c','shangh')
insert into @T (userid,username,usercity) values(4,'d','beijing')
SELECT B.usercity,UserList FROM (
SELECT usercity,
(SELECT username+',' FROM @T WHERE usercity=A.usercity
FOR XML PATH('')) AS UserList
FROM @T A
GROUP BY usercity
) B
insert into @t(number,status,sums) values(1,'N',20)
insert into @t(number,status,sums) values(1,'Y',30)
insert into @t(number,status,sums) values(2,'Y',10)
insert into @t(number,status,sums) values(2,'Y',33)
select * from @t
SELECT
number as 编号,
(CASE WHEN EXISTS(SELECT 1 FROM @t WHERE number=t.number AND status='N') THEN 'N' ELSE 'Y' END) t1,
SUM(sums) AS 数量
FROM @t t
GROUP BY number