SQLSqlserver中如何将一列数据拼接成一个字符串

创建表值函数：

create function [dbo].[GetAssessmentCity](
@ryear varchar(4), --年份
@rmonth varchar(2)  --月份
) returns @GetCity TABLE(id varchar(20),city varchar(20))
as 
begin
	declare @result varchar(1200) --返回结果
	insert into @GetCity 
	select 1, from T_COD_SectionInfo a 
	right join MonthTargetData b on a.section_id=b.section_id 
	where (report_year = @ryear
           and report_month = @rmonth)
           and (value61 = 1
            or value62 = 1)
   return
end

SQL语句：

SELECT ,LEFT(cityList,LEN(cityList)-1) city FROM (
	SELECT  id, (SELECT city+'、' FROM ('2012','01') WHERE id= FOR XML PATH('')) 
	AS cityList FROM ('2012','01') a group by id) b

简单示例：

declare @T Table(Id numeric(18), Code varchar(10))
insert into @T(id,code)
select 1, 'zhang'
union all
select 1, 'yan'
union all
select 2, 'zdw'
union all
select 2, 'ydj';

SELECT ,LEFT(UserList,LEN(UserList)-1) code FROM (
SELECT id,(SELECT code+',' FROM @T WHERE id= FOR XML PATH('')) AS UserList FROM @T A GROUP BY id
) B

方法二：

declare @output varchar(8000)
select @output = coalesce(@output + ',' , '') + name from (SELECT DISTINCT(name) 
		FROM a where R_control='国控' and R_type='重金属河流')AS T
print @output
go

方法三：

DECLARE @STR VARCHAR(8000)
SELECT @STR=ISNULL(@STR+',','')+name FROM (SELECT DISTINCT(name) 
	FROM a where R_control='国控' and R_type='重金属河流')AS T
SELECT @STR
go