范围查询
1,不连续查询-in, not in
查询年龄是12,18,34的学生姓名和年龄信息
select name,age from students where age in (12,18,34);
查询年龄不是12,18,34的学生姓名和年龄信息
select name,age from students where age not in (12,18,34);
2, 连续查询-between and,not between and
查询年龄在12到34之间的学生姓名和年龄信息(包括12和34);
select name,age from students where age between 12 and 34;
查询年龄不在12到34之间的学生姓名和年龄信息(不包括12和34);
select name,age from students where age not between 12 and 34;
