Darn, it's not working after all.
SELECT
people.*,
COUNT ( DISTINCT cars.car_id ) AS car_count,
COUNT ( DISTINCT pets.pet_id ) AS pet_count,
SUM ( IF ( pets.date_bought > NOW() - INTERVAL 7 DAY, 1, 0 ) ) AS
new_pet_count
WHERE...etc
car_count and pet_count are calculating correctly, but new_pet_count
is only correct if the person has 0 new pets. If they have more than
zero, new_pet_count evaluates to pet_count * 2. It seems like I need a
way to combine a "distinct pets.pet_id" with the sum.
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