CREATE TABLE Customers (customer_first_name VARCHAR2, customer_last_name VARCHAR2, customer_id VARCHAR2)
CREATE TABLE Customers_cards (customer_id VARCHAR2)

What is the customer id, first and last name with least number of accounts.
SELECT T1.customer_id, T2.customer_first_name, T2.customer_last_name FROM Customers_cards AS T1 JOIN Customers AS T2 ON T1.customer_id = T2.customer_id GROUP BY T1.customer_id ORDER BY COUNT(*) LIMIT 1
SELECT "T1"."customer_id", "T2"."customer_first_name", "T2"."customer_last_name" FROM "Customers_cards" "T1" JOIN "Customers" "T2" ON "T1"."customer_id" = "T2"."customer_id" GROUP BY "T1"."customer_id" ORDER BY COUNT(*) FETCH FIRST 1 ROWS ONLY