下面哪个表达式不能获取user对象的username属性( )。 A: ${user['username'] } B: ${user[username] } C: ; D: ${user.username }
下面哪个表达式不能获取user对象的username属性( )。 A: ${user['username'] } B: ${user[username] } C: ; D: ${user.username }
删除用户的同时删除用户所拥有的全部对象的正确命令是() A: drop user username cascade B: drop user username C: delete user username D: delete user username cascade
删除用户的同时删除用户所拥有的全部对象的正确命令是() A: drop user username cascade B: drop user username C: delete user username D: delete user username cascade
用户表user中存在一个名字字段username,现查询名字字段中包含"凤"的用户,下列SQL语句中,正确的是() A: select * from user where username = '凤'; B: select * from user where username like '%凤%'; C: select * from user where username like '_凤_'; D: select * from user where username like '凤';
用户表user中存在一个名字字段username,现查询名字字段中包含"凤"的用户,下列SQL语句中,正确的是() A: select * from user where username = '凤'; B: select * from user where username like '%凤%'; C: select * from user where username like '_凤_'; D: select * from user where username like '凤';
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';
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';
从数据表中查询用户信息,以下语句中不正确的是( ) 。 A: select<br/>* from user; B: select<br/>username,password from user; C: select<br/>* from user order username; D: select<br/>* from user where username="admin";
从数据表中查询用户信息,以下语句中不正确的是( ) 。 A: select<br/>* from user; B: select<br/>username,password from user; C: select<br/>* from user order username; D: select<br/>* from user where username="admin";
下列用于更新的SQL语句中,正确的是() A: update<br/>user set id = u001 ; B: update<br/>user(id,username) values('u001','jack'); C: update<br/>user set id='u001',username='jack'; D: update<br/>into user set id = 'u001', username='jack';
下列用于更新的SQL语句中,正确的是() A: update<br/>user set id = u001 ; B: update<br/>user(id,username) values('u001','jack'); C: update<br/>user set id='u001',username='jack'; D: update<br/>into user set id = 'u001', username='jack';
以下语句哪个是正确的Select查询语句( ) A: select * from use B: select distinct username user; C: select * from user where ; D: select * from user username=’李四’;
以下语句哪个是正确的Select查询语句( ) A: select * from use B: select distinct username user; C: select * from user where ; D: select * from user username=’李四’;
下面哪个表达式不能获取user对象的username属性()。
下面哪个表达式不能获取user对象的username属性()。
在DOS命令提示符下输入命名可以查看admin用户的信息? A: net user B: net user Username C: net user admin D: net user administrater
在DOS命令提示符下输入命名可以查看admin用户的信息? A: net user B: net user Username C: net user admin D: net user administrater
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;
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;