SQL select from data in query where this data is not already in the database?

Question

I want to check my database for records that I already have recorded before making a web service call.

Here is what I imagine the query to look like, I just can\'t

Answer 1

How about a nested query? This may work. If not, it may get you in the right direction.

SELECT * FROM table WHERE id NOT IN (
        SELECT id FROM table WHERE 1
);