摘要： 1.在查询结果中显示列名： a.用as关键字：select name as '姓名' from students order by age b.直接表示：select name '姓名' from students order by age 2.精确查找: a.用in限定范围：select * from students where native in ('湖南', '四川') b.between...and：select * from students where age between 20 and 30 c.“=”：sele 阅读全文