--范围查询（区间查询）   --in()   --查询年龄为18,28，38的人   select *from student where age=18 or age=28 or age=38;   select *from student where age in(18,28,38);   --not in   --查询年龄为18,28，38的人   select *from student where not (age=18 or age=28 or age=38);   select *from student where age not in (18,28,38);   --between...and...   --查询12-18的人   select *from student where age between 12 and 18;   -- not between...and...   -- 查询年龄不在12-18的人   select *from student where age not between 12 and 18;   -- 失败select *from student where age not (between 12 and 18);

--判断空       -- is null       -- 判断年龄是否为空       select *from student where age is null;       -- is not NULL       -- 判断年龄不为空       select *from student where age is not null;

转载自：https://www.cnblogs.com/jum-bolg/p/11235427.html