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create table #bom(item varchar(10),subitem varchar(10))
insert into #bom
select 'A设备','a' union all
select 'B设备','1' union all
select 'B设备','2' union all
select 'B设备','3' union all
select 'B设备','4' union all
select 'B设备','5' union all
select 'B设备','6' union all
select 'B设备','7' union all
select 'B设备','8' union all
select 'B设备','9' union all
select 'B设备','10' union all
select 'B设备','11' union all
select 'B设备','12'
create table #r(x varchar(10),item varchar(10))
insert into #r
select 'a','A设备' union all
select 'b1','B设备' union all
select 'b2','B设备'
select items=a.x+'-'+b.subitem
from #r a
inner join #bom b on a.item=b.item
/*
items
---------------------
a-a
b1-1
b1-2
b1-3
b1-4
b1-5
b1-6
b1-7
b1-8
b1-9
b1-10
b1-11
b1-12
b2-1
b2-2
b2-3
b2-4
b2-5
b2-6
b2-7
b2-8
b2-9
b2-10
b2-11
b2-12
(25 行受影响)
*/