Php mysqli 选择位置和顺序

Question

mysqli_query 中的"order by" 标签有问题。 实际上它工作正常，但最后的 order by 只返回这个错误:

There was an error: Unknown column 'id' in 'order clause'

$query2 = "SELECT * FROM items WHERE itemownerid = '".$creatorid."' AND game = 1 AND `game_id` = $gameid order by id desc"; 

Answer 1

实际上错误本身说没有id列存在于您的 items表，这就是为什么 order by id失败。

因此将其更改为有效的列名。一个例子如下:-

$query2 = "SELECT * FROM items WHERE itemownerid = '".$creatorid."' AND game = 1 AND `game_id` = $gameid ORDER BY <write any existing column name of your items table>  DESC"; 

注意:- 请注意@tadman 建议的评论。非常有用和必要