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