CREATE TABLE Orders (customer_id VARCHAR)
CREATE TABLE Customers (customer_last_name VARCHAR, phone_number VARCHAR, customer_id VARCHAR)

What is the customer last name, id and phone number with most number of orders?
SELECT T2.customer_last_name, T1.customer_id, T2.phone_number FROM Orders AS T1 JOIN Customers AS T2 ON T1.customer_id = T2.customer_id GROUP BY T1.customer_id ORDER BY COUNT(*) DESC LIMIT 1
SELECT "T2"."customer_last_name", "T1"."customer_id", "T2"."phone_number" FROM "Orders" AS "T1" JOIN "Customers" AS "T2" ON "T1"."customer_id" = "T2"."customer_id" GROUP BY "T1"."customer_id" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1