下面哪一个语句,显示没有Email地址的教师姓名()
A: Select name from teacher where email=NULL;
B: Select name from teacher where email
C: Select name from teacher where email is NULL;
D: Select name from teacher where emailis not NULL;
A: Select name from teacher where email=NULL;
B: Select name from teacher where email
C: Select name from teacher where email is NULL;
D: Select name from teacher where emailis not NULL;
举一反三
- 在Oracle中，有一个教师表teacher的结构如下： 下面哪个语句显示没有Email地址的教师的姓名（）。 A: select name from teacher where email=null B: select name from teacher where email<>null C: select name from teacher where email is null D: select name from teacher where email is not null
- 查询student表中的所有非空email信息, 以下语句正确的是（ ） A: Select email from student where email !=null B: Select email from student where email not is null C: Select email from student where email <> null D: Select email from student where email is not null
- 若想查询student表中name为空值的记录，则正确的SQL语句是（ ）。 A: SELECT * FROM student WHERE name = NULL; B: SELECT * FROM student WHERE name like NULL; C: SELECT * FROM student WHERE name = 'NULL'; D: SELECT * FROM student WHERE name is NULL;
- 若想查询student表中name为空值的记录，则正确的SQL语句是（1.0分） A: select * from student where name = null; B: select * from student where name link null; C: select * from student where name = 'null'; D: select * from student where name is null;
- 下面查询语句中哪条查询语句会查询出所有包含"李"的数据？ A: select * from student where name limit‘%李%’ B: select * from student where name =‘%李%’ C: select * from student where name like‘%李%’ D: select * from student where name in‘%李%’