Question

I have a simple problem. I have two tables FROM and TO. I want to copy column Group from FROM to TO but only the rows which match the id_number. It should be very simple but I am stuck.

insert into TO (Group)
   SELECT Group 
   FROM FROM
   WHERE FROM.id_number like TO.id_number

OR

INSERT INTO TO (Group)
   SELECT Group 
   FROM FROM
   WHERE id_number IN (SELECT id_number FROM TO)

This one just adds additional columns to the table, it does not update the rows as per id_number….

Any idea?

Answer 1

You say “only the rows which match the id_number”. That implies update not insert.

update [TO] set [Group] = [FROM].[Group]
from [FROM]
inner join [TO] on [FROM].id_number = [TO].id_number