TSQL: UPDATE with INSERT INTO SELECT FROM

Question

so I have an old database that I\'m migrating to a new one. The new one has a slightly different but mostly-compatible schema. Additionally, I want to renumber all tables from

Answer 1

Is there a way to do this UPDATE via INSERT INTO SELECT FROM so I don't have to process every record manually?

Since you wouldn't want to do it manually, but automatically, create a trigger on MV6.Posts so that UPDATE occurs on MV5.Posts automatically when you insert into MV6.Posts.

And your trigger might look something like,

create trigger trg_MV6Posts
on MV6.Posts
after insert
as
begin
    set identity_insert MV5.Posts on

    update  MV5.Posts
    set ID = I.ID
    from    inserted I

    set identity_insert MV5.Posts off
end