text: SELECT p.*, l.*
  FROM posts p LEFT OUTER JOIN likes l ON (p.user = l.user) 
  limit 10;
  
  SELECT p.*, l.*
  FROM posts p RIGHT OUTER JOIN likes l ON (p.user = l.user)
  limit 10;
  
  SELECT p.*, l.*
  FROM posts p FULL OUTER JOIN likes l ON (p.user = l.user)
  limit 10;
  