Table schema:
CREATE TABLE savings (balance VARCHAR, custid VARCHAR); CREATE TABLE checking (custid VARCHAR, balance VARCHAR); CREATE TABLE accounts (custid VARCHAR)

Question: Find the saving balance of the account with the highest checking balance.
SQL: 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