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id    signup_number    products
1    2009001213      2,3,5,7
2    2009001213      2,3,5
3    2009001213      2
4    2009001557      4,5,6
5    2009001557      4,5
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--> ²âÊÔÊý¾Ý£º[TB]
if object_id('[TB]') is not null drop table [TB]
create table [TB]([id] int,[signup_number] int,[products] varchar(7))
insert [TB]
select 1,2009001213,'2,3,5,7' union all
select 2,2009001213,'2,3,5' union all
select 3,2009001213,'2' union all
select 4,2009001557,'4,5,6' union all
select 5,2009001557,'4,5'

select * from [TB]


select signup_number,
products=substring(a.products,b.number,charindex


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