例子1：求年龄在20与22岁之间（包括20 和 22）的学生的学号和年龄
select number,age
from s
where age between 20 and 22
例子2：求年龄不在20与22岁之间的学生的学号和年龄
select number,age
from s
where age not between 20 and 22
注意：between后面是低值,and 后面是高值！
select number,age
from s
where age between 20 and 22
例子2：求年龄不在20与22岁之间的学生的学号和年龄
select number,age
from s
where age not between 20 and 22
注意：between后面是低值,and 后面是高值！
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