Question

I am trying to optimize a query and stuck. Any help appreciated. Basically there are two tables, one for people and another for events for the people. The structure is something like –

table 1 - people - columns - peopleid, name
table 2 - events - columns - event name, peopleid, description

I want to figure out the people with no events, without using a subquery. I was doing it with a subquery but the performance has degraded a lot and i need to optimize.

Thanks for any help

Answer 1

   SELECT p.peopleid,
          p.name
     FROM people p
LEFT JOIN events e ON e.peopleid = p.peopleid
    WHERE e.peopleid IS NULL