排序檢索數據
1.按照某一列數據進行排序:select name,id from shopping order by id;
2.按照多列數據進行排序: select name,id from shopping order by id,name;
(這個排序是有一定的順序,id在前就先按照id排序,如果id每一項都是唯一的,這個後面的排序規則就沒用了)
3.按照降序進行排序:select name,id from shopping order by id desc;
4.設定多行排序規則,有些升序有些降序:select name,id from shopping order by name asc, id desc;
5.oder by和limit結合使用:select name,id from shopping order by id desc limit 3;
(limit必須要在order by的後面)