mysql order by语句,无限分类问题
老师请帮忙看看?
无限分类里里面的同级分类如何实现再排序
<code>SELECT `DishCategory_Path`,`DishCategory_Name`,`DishCategory_Sort`,concat(`DishCategory_Path`,'-',id) as fullpath from chi_category order by fullpath asc,`DishCategory_Sort`asc </code>
fullpath是排序了,但是因为order by要求当按照多个列进行排序时,只有第一列相同时才使用第二列。但是第一组fullpath是不可能相同的。请问现在怎么实现比如 如图中红酒下级分类 红酒1和红酒2这两个再实现排序。
求教了
回复内容:
老师请帮忙看看?
无限分类里里面的同级分类如何实现再排序
<code>SELECT `DishCategory_Path`,`DishCategory_Name`,`DishCategory_Sort`,concat(`DishCategory_Path`,'-',id) as fullpath from chi_category order by fullpath asc,`DishCategory_Sort`asc </code>
fullpath是排序了,但是因为order by要求当按照多个列进行排序时,只有第一列相同时才使用第二列。但是第一组fullpath是不可能相同的。请问现在怎么实现比如 如图中红酒下级分类 红酒1和红酒2这两个再实现排序。
求教了
我仔细看了一下问题.
现在的第一个字段就是父级...
只需要一股脑的把所有分类全取出来,再用动态语言去排序即可。
旧答案:
再加一个字段
father
,红酒1和红酒2的father
都是0-12-16
,即可。
<code>SELECT DishCategory_Path,DishCategory_Name,DishCategory_Sort, concat(DishCategory_Path,'-',id) as fullpath from chi_category order by concat(DishCategory_Path,'-',DishCategory_Sort) </code>
这句话的效果
其实我不知道这个问题最终是为了要解决什么问题,需求是什么没说清楚。
如果要在页面上按排序输出二级分类,那不是SQL做的事情。

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