Database: dog_kennels
Question: Which owner has paid the largest amount of money in total for their dogs? Show the owner id and zip code.
SQL: select t1.owner_id ,  t1.zip_code from owners as t1 join dogs as t2 on t1.owner_id  =  t2.owner_id join treatments as t3 on t2.dog_id  =  t3.dog_id group by t1.owner_id order by sum(t3.cost_of_treatment) desc limit 1