Postgres: how to find absent users in DB

Question

Regular tasks when need to compare two db. Somene has sent me list of users, that should be in my database. 127 positions.

When I make SELECT * FROM users WHERE id

Answer 1

Based on your comment:

select * from [given_list] EXCEPT select * from [already_in_database] 

This will return the users who are in one list but not the other.

Obviously, without more information it is hard to make use of primary keys, and so forth