////////////////////////////////////Order by子句/////////////////////////////////////
//1.可以按一个或多个属性列排序
//2.升序：asc;降序：desc;缺省为升序；
select * from 表名 order by 属性，属性，属性desc;
////////////////////////////////////////聚集函数////////////////////////////////////////
count();sum();MAX();MIN();AVG();
////////////////////////////////////////group by///////////////////////////////////////
select 属性，属性 from 表单 group by 属性。
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本文标题：Third Day
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