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create table #tb
(
id int not null,
tb_name varchar(10)not null 
)
insert #tb
select id=1,tb_name ='a'
union all
select id=2,tb_name='b'
union all
select id=3,tb_name='c'
union all
select id=4,tb_name='d'

select * from #tb
id          tb_name
----------- ----------
1          a
2          b
3          c
4          d

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SQL code:
create table #tb
(
id int not null,
tb_name varchar(10)not null
)
insert #tb
select id=1,tb_name ='a'
union all
select id=2,tb_name='b'
union all
select id=3,tb_name='c'
union all
select id=4,tb_name='d'

declare @sql nvarchar(20)
select @sql=isnull(@sql,'')+t1.tb_name+t.tb_name from #tb t,#tb t1 where t.tb_name>t1.tb_name
select @sql


--------------------
abacadbcbdcd

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