Can SQL calculate aggregate functions across multiple tables?

Question

Let\'s say I have two existing tables, \"dogs\" and \"cats\":

 dog_name | owner
 ---------+------
 Sparky   | Bob
 Rover    | Bob
 Snoopy   | Chuck
 Odie             


        

Answer 1

I prefer this one:

select owner
     , count(dog_name) dogs
     , count(cat_name) cats
  from cats FULL OUTER JOIN dogs ON (cats.owner = dogs.owner)