INSERT INTO Customer (c_id, c_name, city, grade, s_id)
VALUES
    (1, 'A', 'barisal', 4, 2),
    (2, 'B', 'arisal', 3, 1),
    (3, 'C', 'risal', 2, 3),
    (4, 'D', 'isal', 3, 4);
  

INSERT INTO order_1 (o_no, purchase_amount, order_date, c_id, s_id)
VALUES
    (101, 250.00, '2023-07-27', 1, 1),
    (102, 150.50, '2023-07-28', 2, 2),
    (103, 300.75, '2023-07-29', 3, 3);