text: INSERT INTO orders (id, customer_uid, order_date) VALUES (1, 1, to_date('2018-05-30', 'YYYY-MM-DD'))
  INSERT INTO orders (id, customer_uid, order_date) VALUES (2, 2, to_date('2018-04-12', 'YYYY-MM-DD'))
  INSERT INTO orders (id, customer_uid, order_date) VALUES (3, 5, to_date('2018-04-14', 'YYYY-MM-DD'))
  INSERT INTO orders (id, customer_uid, order_date) VALUES (4, 4, to_date('2018-04-25', 'YYYY-MM-DD'))
  INSERT INTO order_items (id, order_id, product_uid, quantity, price) VALUES (1, 1, 4, 1, 30)
  INSERT INTO order_items (id, order_id, product_uid, quantity, price) VALUES (2, 1, 3, 1, 50)
  INSERT INTO order_items (id, order_id, product_uid, quantity, price) VALUES (3, 1, 5, 1, 200)
  INSERT INTO order_items (id, order_id, product_uid, quantity, price) VALUES (4, 1, 1, 4, 5)
  INSERT INTO order_items (id, order_id, product_uid, quantity, price) VALUES (5, 1, 2, 1, 60)
  INSERT INTO order_items (id, order_id, product_uid, quantity, price) VALUES (6, 1, 6, 1, 20)
  INSERT INTO order_items (id, order_id, product_uid, quantity, price) VALUES (7, 2, 3, 1, 45)
  INSERT INTO order_items (id, order_id, product_uid, quantity, price) VALUES (8, 2, 6, 1, 20)
  INSERT INTO order_items (id, order_id, product_uid, quantity, price) VALUES (9, 3, 1, 5, 5)
  INSERT INTO order_items (id, order_id, product_uid, quantity, price) VALUES (10, 4, 2, 1, 60)
  