CREATE TABLE customer (cust_id CLOB, cust_name CLOB, acc_type CLOB, acc_bal NUMBER, no_of_loans NUMBER, credit_score NUMBER, branch_id NUMBER, state CLOB)
CREATE TABLE bank (branch_id NUMBER, bname CLOB, no_of_customers NUMBER, city CLOB, state CLOB)
CREATE TABLE loan (loan_id CLOB, loan_type CLOB, cust_id CLOB, branch_id CLOB, amount NUMBER)

Find the state which has the most number of customers.
SELECT state FROM bank GROUP BY state ORDER BY SUM(no_of_customers) DESC LIMIT 1
SELECT "state" FROM "bank" GROUP BY "state" ORDER BY SUM("no_of_customers") DESC FETCH FIRST 1 ROWS ONLY