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--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 |
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