الربط بين جدولين

CREATE TABLE customers (
  id   INTEGER PRIMARY KEY,
  name TEXT NOT NULL,
  city TEXT NOT NULL
);

CREATE TABLE orders (
  id          INTEGER PRIMARY KEY,
  customer_id INTEGER REFERENCES customers(id),
  total       INTEGER NOT NULL,
  placed_on   TEXT    NOT NULL
);

INSERT INTO customers (id, name, city) VALUES
  (1, 'ليان', 'الرياض'),
  (2, 'خالد', 'جدة'),
  (3, 'ريم',  'الدمام'),
  (4, 'فهد',  'الرياض');

INSERT INTO orders (customer_id, total, placed_on) VALUES
  (1, 120, '2026-09-01'),
  (1,  80, '2026-09-12'),
  (2, 300, '2026-09-03'),
  (3,  45, '2026-09-20'),
  (2,  60, '2026-09-25');