CREATE TABLE checking (custid DECIMAL, balance DECIMAL)
CREATE TABLE savings (custid DECIMAL, balance DECIMAL)
CREATE TABLE accounts (custid DECIMAL, name TEXT)

What is the savings balance of the account belonging to the customer with the highest checking balance?
SELECT T3.balance FROM accounts AS T1 JOIN checking AS T2 ON T1.custid = T2.custid JOIN savings AS T3 ON T1.custid = T3.custid ORDER BY T2.balance DESC LIMIT 1
SELECT "T3"."balance" FROM "accounts" AS "T1" JOIN "checking" AS "T2" ON "T1"."custid" = "T2"."custid" JOIN "savings" AS "T3" ON "T1"."custid" = "T3"."custid" ORDER BY "T2"."balance" DESC NULLS LAST LIMIT 1