求一sql2000可用的通用的行转列函数
我自己写的转换一个表的函数
想改写成一个通用的,那就不用每个表需要定义一个转换一个表的函数
了,形式大约如下
f_行转列(表名,列名,where条件,分隔符)
返回一行由列名+分隔符组成的字符串
如有表
bh,mc
1,A1
2,B1
1,A2
2,B2
1,A3
传入where 条件 bh=1
分隔符",",返回 A1,A2,A3,
--我自己写的转换一个表的函数create function [dbo].[f_czy_role](@gh varchar(20))returns varchar(254)asbeginDECLARE @str VARCHAR(MAX)SET @str=''SELECT @str=@str+a+'/' FROM (SELECT distinct r.rolename a FROM t_role_czy t,t_role r where t.rolecode=r.rolecode and t.czygh=@gh ) T return @strend
/*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 aa1 bb2 aaa2 bbb2 ccc需要得到结果:id value------ -----------1 aa,bb2 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)asbegin declare @str varchar(1000) select @str = isnull(@str + ',' , '') + cast(value as varchar) from tb where id = @id return @strendgo--调用函数select id , value = dbo.f_str(id) from tb group by iddrop function dbo.f_strdrop 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 tbgroup 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')godeclare @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 forselect id , value from tbdeclare @id_old int , @id int , @value varchar(10) , @s varchar(100)open my_cursorfetch my_cursor into @id , @valueselect @id_old = @id , @s=''while @@FETCH_STATUS = 0begin 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 , @valueENDinsert @t values(@id_old , stuff(@s,1,1,''))close my_cursordeallocate my_cursorselect * from @tdrop table tb