A: SELECT user FROM mysql.user;
B: SELECT USER();c、SELECT * FROM user;D、SELECT user FROM mysql;
举一反三
- 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;
- 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’;
- 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";
- 下列哪些SQL语句可以查询出User表中name为张三的记录（）。 A: SELECT * FROM User WHERE name = ’张三’ B: SELECT * FROM User WHERE name = ’张三’ LIMIT 0，1 C: SELECT * FROM User WHERE name LIKE ’张三’ D: SELECT * FROM User WHERE name LIKE ’%张三%’
- 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';
内容
- 0
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;
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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;
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【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’;
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在tb_name表中创建一个名为name_view的视图,并设置视图的属性为name、pwduser,执行语句是什么?( ) A: CREATE VIEW name_view(name,pwd,user)AS SELECT name.pwd,user FROM tb_mame; B: SHOW VIEW name_view(name,pwd,user) AS SELECT name,pwd,user FROM tb_mame: C: DROP VIEW name_view(name,pwd,user) AS SELECT name,pwd,user FROM tb_mame: D: SELECT * FROM name_view(name,pwd,user) AS SELECT name,pwd,user FROM tb_ name:
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【多选题】已知user表中存在一个字段id。 下面选项中,能够查询出id编号为u001和u002的用户的SQL语句是 A. select * from user where id = 'u001' and id = 'u002'; B. select * from user where id = 'u001' or id = 'u002'; C. select * from user where