CREATE TABLE addresses (address_id NUMBER, line_1_number_building CLOB, city CLOB, zip_postcode CLOB, state_province_county CLOB, country CLOB)
CREATE TABLE contacts (contact_id NUMBER, customer_id NUMBER, gender CLOB, first_name CLOB, last_name CLOB, contact_phone CLOB)
CREATE TABLE customer_address_history (customer_id NUMBER, address_id NUMBER, date_from TIME, date_to TIME)
CREATE TABLE order_items (order_item_id NUMBER, order_id NUMBER, product_id NUMBER, order_quantity CLOB)
CREATE TABLE customers (customer_id NUMBER, payment_method_code CLOB, customer_number CLOB, customer_name CLOB, customer_address CLOB, customer_phone CLOB, customer_email CLOB)
CREATE TABLE customer_orders (order_id NUMBER, customer_id NUMBER, order_date TIME, order_status_code CLOB)
CREATE TABLE products (product_id NUMBER, product_type_code CLOB, product_name CLOB, product_price NUMBER)

What are the name and phone of the customer with the most ordered product quantity?
SELECT T1.customer_name, T1.customer_phone FROM customers AS T1 JOIN customer_orders AS T2 ON T1.customer_id = T2.customer_id JOIN order_items AS T3 ON T3.order_id = T2.order_id GROUP BY T1.customer_id ORDER BY SUM(T3.order_quantity) DESC LIMIT 1
SELECT "T1"."customer_name", "T1"."customer_phone" FROM "customers" "T1" JOIN "customer_orders" "T2" ON "T1"."customer_id" = "T2"."customer_id" JOIN "order_items" "T3" ON "T2"."order_id" = "T3"."order_id" GROUP BY "T1"."customer_id" ORDER BY SUM("T3"."order_quantity") DESC FETCH FIRST 1 ROWS ONLY