text: insert into user(id, username, name, age, balance) values(1, 'zhangsan', '张三', 20, 100.00);
  insert into user(id, username, name, age, balance) values(2, 'lisi', '李四', 30, 110.00);
  
  INSERT INTO product(id, name, price) VALUES (1, '测试产品', 50);