title: Query to show whether an entry from one table is in the other
body: <p>This might be simple, but I can't figure it out.
  In one table i have all the people, in the other some event with that people.
  I'd like to make a query where in first coloumn I get a list of people from table one and in the other a simple yes/no, based on whether their ID is in table two.</p>