[单选择]以下哪个SQL语句是正确的( )

  1. create table (Code int primary key);
  2. insert into users (‘p001’,’张三’,’男’);
  3. select Code as ‘代号’ from users;
  4. update users Code=’p002’ where Code=’p001’;
参观人数:838 ,参试人数:3,正确率:67%