sql查询——范围查询（区间查询）

 --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;

转载注明出处：https://www.cnblogs.com/jum-bolg/p/11235427.html