Question

Why does this sql query only show results if they only have a row in users_warnings?

SELECT 
 u.id, 
 uw.warning 
FROM 
 users u
 INNER JOIN users_warnings uw ON (
  u.id = uw.uID
 )
LIMIT 21

I wish to show all users, but also grab the column “warning” in users_warnings, if any.

Answer 1

An INNER JOIN only returns something if there is data in both tables.
Try a LEFT JOIN instead:

SELECT u.id, uw.warning FROM users u
            LEFT JOIN users_warnings uw ON (u.id = uw.uID)
            LIMIT 21