text: CREATE TABLE IF NOT EXISTS post_like(
  post_id INT NOT NULL,
  user_id VARCHAR(20) NOT NULL,
  PRIMARY KEY(post_id, user_id),
  FOREIGN KEY(user_id) REFERENCES user(user_id) ON DELETE CASCADE ON UPDATE CASCADE,
  FOREIGN KEY(post_id) REFERENCES post(post_id) ON DELETE CASCADE ON UPDATE CASCADE
  )ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;