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

If your database can handle it, I'd double down on FerranB's solution and write a geeky NATURAL FULL JOIN solution. I mean, when was the last time you got the chance to do so?

SELECT owner, COUNT(dog_name), COUNT(cat_name)
FROM cats 
NATURAL FULL JOIN dogs
GROUP BY owner