CREATE TABLE Customer_Address_History (customer_id NUMBER, address_id NUMBER, date_from DATETIME, date_to DATETIME)
CREATE TABLE Customer_Orders (order_id NUMBER, customer_id NUMBER, order_date DATETIME, order_status_code VARCHAR2)
CREATE TABLE Order_Items (order_item_id NUMBER, order_id NUMBER, product_id NUMBER, order_quantity VARCHAR2)
CREATE TABLE Products (product_id NUMBER, product_type_code VARCHAR2, product_name VARCHAR2, product_price DOUBLE PRECISION)
CREATE TABLE Customers (customer_id NUMBER, payment_method_code VARCHAR2, customer_number VARCHAR2, customer_name VARCHAR2, customer_address VARCHAR2, customer_phone VARCHAR2, customer_email VARCHAR2)
CREATE TABLE Addresses (address_id NUMBER, line_1_number_building VARCHAR2, city VARCHAR2, zip_postcode VARCHAR2, state_province_county VARCHAR2, country VARCHAR2)
CREATE TABLE Contacts (contact_id NUMBER, customer_id NUMBER, gender VARCHAR2, first_name VARCHAR2, last_name VARCHAR2, contact_phone VARCHAR2)

Show the product name and total order quantity for each product in a bar chart.
SELECT T1.product_name, SUM(SUM(T2.order_quantity)) FROM Products AS T1 JOIN Order_Items AS T2 ON T1.product_id = T2.product_id GROUP BY T1.product_name
SELECT "T1"."product_name", SUM(SUM("T2"."order_quantity")) FROM "Products" "T1" JOIN "Order_Items" "T2" ON "T1"."product_id" = "T2"."product_id" GROUP BY "T1"."product_name"