Question

How to merge columns into one table?

declare @map_old table(ID int not null) 
insert into @map_old select 1
insert into @map_old select 2

declare @map_new table(ID int not null) 
insert into @map_new select 11
insert into @map_new select 22

declare @map(ID int not null, ID2 int not null)

the result in @map should be:

ID   ID2
1    11
2    22

Any suggestions? Thx!

Answer 1

you can use identity in the tables like as follows:

declare @map_old table(iden int identity,ID int not null) 
insert into @map_old select 1
insert into @map_old select 2

declare @map_new table(iden int identity,ID int not null) 
insert into @map_new select 11
insert into @map_new select 22

declare @map table(ID int not null, ID2 int not null)

insert into @map
select t.ID, t2.ID from @map_old t join @map_new t2 on  t.iden = t2.iden