以下可以正确运行的查询语句有( ) A: select * from user ; B: select * from user where username =’李四’; C: select * from user where 1=1; D: select distinct * from user;

用E-Mail发送信件时须知道对方的地址，下列表示中（）是合法、完整的E-Mail地址。 A: center. zjnu. edu. cn@user1 B: user1@center. zjnu. edu. Cn C: user!. center. zjnu. edu. cn D: user1 $ center. zjnu. edu. Cn

【多选题】下面语句可以实现查询user表中“zhangsan”的user,password,logins信息的是 A. select logins,user,password from user where name like ’%zhangsan%’; B. select user,password,logins, from user where name like ’zhangsan’; C. select password,logins,user from user where name=’zhangsan’ limit 1; D. select user,password,logins from user where name=’zhangsan’;

已知用户表 user 有多列,其中字段 id 没有 NULL 值,字段username有NULL值,选项中,不能获得 user 表的总记录数量的 SQL 语句是 A: SELECT COUNT (*) FROM user ; B: SELECT COUNT ( id ) FROM user ; C: SELECT COUNT ( username ) FROM user ; D: SELECT COUNT ( id ) FROM user WHERE 1=1;

How many bike sharing companies signed an agreement with the National Development and Reform Commission (国家发改委) and the National Information Center (国家信息中心) on April 27th, 2017, authorizing the sharing of user data.

下面选项中,能够更新user表中数据的SQL语句是() A: update into user set id = 'u001'; B: update user set id = 'u001' and username='jack'; C: update user set username='jack' where id = 1; D: update into user set id = 'u001', username='jack';

将字段User改为user需要编写| rename User user

一个APN下最多可以绑定个_____________User Profile和_____________个缺省的User Profile。 A: 30 1 B: 30 2 C: 50 1 D: 50 2

假定用户表user有多列，其中字段id中没有null值，字段username中存在null值。下面选项中，不能获得user表的总记录数的SQL语句是（ ） A: select count(*) from user; B: select count(id) from user; C: select count(username) from user; D: select count(id) from user where1=1;

已知，存在 QueryRunner对象 runner ， SQL语句：String sql = "select * from user";下面操作中，能实现查询所有记录的选项是（） A: List<;User>; list=runner.query(sql, newBeanHandler<;User>;(User.class)); B: List<;User>; list=runner.query(sql, new BeanListHandler<;User>;(User.class));Object num =runner.delete(1, sql); C: Object list=runner.query(sql, new BeanHandler<;User>;(User.class)); D: List list=runner.query(sql, new BeanHandler<;User>;(User.class));