A: select * from user ;
B: select * from user where username =’李四’;
C: select * from user where 1=1;
D: select distinct * from user;
举一反三
- 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";
- 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';
- 【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’;
- 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%’
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;
- 1
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;
- 2
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- 3
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- 4
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