[单选择]以下哪个SQL语句是正确的( )

  1. select Code as ‘代号’ from users;
  2. update users Code=’p002’ where Code=’p001’;
  3. insert into users (‘p001’,’张三’,’男’);
  4. create table (Code int primary key);
参观人数:667 ,参试人数:3,正确率:67%