sql 截取字符串

有个字符串s1 = '11&Red&12&'，我怎么截取出11，Red，12呢？

---

参考
SQL code:
/*
名称：fn_split函数.
功能：实现字符串分隔功能的函数
*/
create function dbo.fn_split(@inputstr varchar(8000), @seprator varchar(10))
returns @temp table (a varchar(200))
as
begin
declare @i int
set @inputstr = rtrim(ltrim(@inputstr))
set @i = charindex(@seprator , @inputstr)
while @i >= 1
begin
insert @temp values(left(@inputstr , @i - 1))
set @inputstr = substring(@inputstr , @i + 1 , len(@inputstr) - @i)
set @i = charindex(@seprator , @inputstr)
end
if @inputstr <> '\'
insert @temp values(@inputstr)
return
end
go

--调用
declare @str as varchar(30)
set @str = '1,2,3,4,5'

---

SQL code:
--轉老大
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[f_GetStr]') and xtype in (N'FN', N'IF', N'TF'))
drop function [dbo].[f_GetStr]
GO
--分段截取函数
CREATE FUNCTION dbo.f_GetStr(
@s varchar(8000), --包含多个数据项的字符串
@pos int, --要获取的数据项的位置
@split varchar(10) --数据分隔符
)RETURNS varchar(100)
AS
BEGIN
IF @s IS NULL RETURN(NULL)
DECLARE @splitlen int
SELECT @splitlen=LEN(@split+'a')-2
WHILE