python变量命名正确的是（ ） A: #a1 B: 123user C: if D: _user

建立账号stu的命令是（）（密码是123）。 A: Anet user 123 stu B: Bnet user 123 stu /add C: Cnet use 123 stu /add D: Dnet user stu 123 /add

使用CREATE USER语句创建一个新用户,用户名为user2、密码为123 下面选项中,能实现上述功能的语句是 A: CREATE USER 'user2'@'localhost' IDENTIFIED BY '123'; B: CREATE USER user2@localhost IDENTIFIED BY 123; C: CREATE USER 'user2'@'localhost' IDENTIFIED TO '123'; D: CREATE USER user2@localhost IDENTIFIED TO '123';

用命令方式创建一个新用户zhangsan并设置密码为123,以下正确的是() A: net user zhangsan /add B: net user zhangsan 123 /add C: net user zhangsan 123 /del D: net user zhangsan 123

使用GRANT语句创建用户名为user1、密码为123,并授予该用户对chapter08.student表有查询权限。 下面选项中,能实现上述功能的语句是 A: GRANT SELECT ON chapter08.student FOR 'user1'@'localhost' IDENTIFIED BY '123'; B: GRANT USER SELECT ON chapter08.student TO 'user1'@'localhost' IDENTIFIED BY '123'; C: GRANT USER SELECT ON chapter08.student 'user1'@'localhost' IDENTIFIED BY '123'; D: GRANT SELECT ON chapter08.student TO 'user1'@'localhost' IDENTIFIED BY '123';

将字段User改为user需要编写| rename User user

以下选项中，哪些属于合法的标识符（） A: class B: 123user C: user123 D: Hello_world

已知,存在 QueryRunner对象 runner , SQL语句: String sql = "select * from user where id=?"; 下面操作中,能实现查询指定记录的选项是() A: User user=(User)runner.query(sql, new BeanListHandler(User.class), new Object[]{id}); B: User user=(User)runner.query(sql, new BeanHandler(User.class)); C: User user=(User)runner.query(sql, new BeanListHandler(User.class), id); D: User user=(User)runner.query(sql, new BeanHandler(User.class), new Object[]{id});

下选项中，哪些是合法的标识符 A: username B: 123user C: this&that D: aa$bb

request.setAttribute("user","svse");session.setAttribute("user","bob");使用{user}则显示( )