下面SQL语句中,用于删除student表中age小于20的记录的语句是
A: DELETE student where age<20;
B: DELETE FROM student where age<20;
C: DELETE FROM student set age<20;
D: DELETE studentset age<20;
A: DELETE student where age<20;
B: DELETE FROM student where age<20;
C: DELETE FROM student set age<20;
D: DELETE studentset age<20;
举一反三
- 有学生信息表student,求年龄在20~22岁之间(含20岁和22岁)的学生姓名和年龄的SQL语句是:SELECT sname,age FROM student WHERE age( )。 A: >20 and age<22 B: BETWEEN 20 AND 22 C: >=20 and age<22 D: >20 and age<=22
- 学生表student中,将年龄小于30岁的记录删除,下面的语句正确的是( )。 A: DELETE FROM student FOR age<;30 B: DELETE FROM student WHERE age<;30 C: DELETE TABLE student WHERE age<;30 D: DELETE FROM student HAVING age<;30
- 下面 语句和”select * from student where sex=’男’ && age=20;”语句查询出的结果是一样的。( ) A: select * from student where sex=’男’ or age=20; B: select * from student where sex=’男’ || age=20; C: select * from student where sex=’男’ and age=20; D: select * from student where sex,age in(’男’,20);
- 数据库中有一张表名称为Student,有列Name,Age,IDCard,Sex。要求写SQL语句查询出表中年龄介于20和30岁之间的数据,下列哪个SQL语句是正确的?() A: Select* From Student Where Age>=20 ANDAge>=30 B: Select* From Student Where Age>=20 ANDAge<=30 C: Select* From Student Where Age BET WENN 20AND30 D: Select* From Student Where Age>=20&&Age>=30"
- 对于学生信息表:student(sno,sname,sex,age,dept),能够得到年龄在20岁至22岁之间的学生的姓名和学号的语句是( )。 A: SELECT*FROM student WHERE age BETWEEN 20 AND 22 B: SELECT sname,sno FROM student WHERE age BETWEEN 20 AND 22 C: SELECT sname,sno FROM student WHERE age>=20 D: SELECT sname,sno FROM student WHERE age<=22