摘要：
检索不同的行：select vend_idfrom products;/*返回不同的值*/select distinct vend_idfrom products;限制结果：limit/*limit 5 指示sql返回不多于5行*/select vend_id from products limit 5;/*指定要检索的开始行和行数*/select prod_name from products limit 5,5;检索排序：order by/*从小到大*/select prod_name from products order by prod_name;/*按多个列排序*/select p. 阅读全文
