Question

I want to insert records in a table with a column having same value for all the records being inserted.
How to do it without changing table structure.

Insert into tableA(clientid,no_of_users)
select clientid
from tableB

I want no-of_users =3 for all the records

Answer 1

You can use a DEFAULT Constraint for this, read about it on MSDN.

Without changeing the table structure, just simple use this:

Insert into tableA(clientid,no_of_users)
select clientid, 3
from tableB

With using this statement, you can always think about the INSERT as the output what you would like to see of your SELECT.