Mysql codeigniter php asc desc order by count result使用php

问题描述

我有三个名为的表：

at_category：

1. cat_id


2. 名称

at_categorytaxonomy：

1. cat_taxonomy_id


2. cat_id


3. 分类

at_shop：

1. shop_id


2. shop_category

我想通过计算结果来加入这三个表。 p>

例如，在 at_category 表中命名为电子商店的类别，在 at_category_taxonomy 表中，并且此类别ID在 at_shop 表中有两个商店。

例如：aaa，bbb，ccc

  1。 at_category 
 
 ______________ 
 
 cat_id name 
 
 1电子商店
 2冰淇淋店
 _______________ 
 
 2. at_category_taxonomy 
 
 _______________________________________________ 
 
 cat_taxonomy_id cat_id taxonomy 
 
 3 1电子商店
 4 2冰淇淋店
 _______________________________________________ 
 
 3. at_shop 
 
 ________________________________ 
 
 shop_id shop_name shop_category 
 
 1 A 1（即电子商店）
 2 B 1（即电子商店）
 3 C 1（即电子商店）
 4 D 2（即冰淇淋店）
 
 ________________________________ 
  

现在：类别有3家商店的电子商店和有1家商店的冰淇淋店

期望输出：

  （描述）类别名称（ASC）
 
 3电子商店
 1冰淇淋店
  

当我在商店列中点击asc订单时，输出将是

 否.Of.Shops（ASC）（Desc）类别名称（ASC）
 
 1冰淇淋店
 3电子商店
  pre> 
 
 
这是类别名的对应。 
 
 
 
现在我想使用codeigniter按照desc命令显示结果。
解决方案
选择电子邮件，计数（*）为c FROM订单GROUP BY电子邮件
  $ this- ; db-> select（'COUNT（sh.shop_category）as No_of_shops，cat.name as category_name'，FALSE）; 
 $ this-> db-> from（'at_shop sh'）; 
 $ this-> db-> join（'at_category cat'，'cat.cat_id = sh.shop_category'）; 
 $ this-> db-> order_by（'sh.shop_category'）; 
 $ query = $ this-> db-> get（）; 
 retuen $ query-> result_array（）; 
  
 
I have three tables named:
at_category:
cat_id
name
at_category_taxonomy:
cat_taxonomy_id
cat_id
taxonomy
at_shop:
shop_id
shop_category
I want to join those three tables by counting result.
For example the category named as Electronic Shops in at_category table and the value will be stored in at_category_taxonomy table and the this category id's are having two shops in at_shop table. same as for remaining categories aaa, bbb, ccc etc...it may be having one or two shops else zero shops.
Example :
1. at_category

    ______________

    cat_id   name

     1       Electronic Shops
     2       Ice Cream Shops
    _______________

    2. at_category_taxonomy

    _______________________________________________

    cat_taxonomy_id   cat_id   taxonomy

      3                 1       Electronic Shops
      4                 2       Ice Cream Shops
    _______________________________________________

    3. at_shop

    ________________________________

    shop_id   shop_name   shop_category

     1            A         1 (ie.Electronic Shops)
     2            B         1 (ie.Electronic Shops)
     3            C         1 (ie.Electronic Shops)
     4            D         2 (ie.Ice Cream Shops)

    ________________________________
Now : The category Electronic Shops having 3 shops and Ice cream shops having 1 shop
Expecting output :
No.Of.Shops (ASC) (Desc)    Category Name   (ASC) (Desc)

     3                         Electronic Shops
     1                         Ice cream Shops
When i click asc order in no.of shops column then the output will be
No.Of.Shops (ASC) (Desc)    Category Name   (ASC) (Desc)

     1                          Ice cream Shops
     3                          Electronic Shops
This is vise verse for category name too.  
now I want to display the result by count the number shops by desc order using codeigniter.
 解决方案 
select email, count(*) as c FROM orders GROUP BY email
$this->db->select('COUNT(sh.shop_category) as No_of_shops,cat.name as category_name',FALSE);
$this->db->from('at_shop sh');
$this->db->join('at_category cat', 'cat.cat_id = sh.shop_category');
$this->db->order_by('sh.shop_category');
$query = $this->db->get();
retuen $query->result_array();
                        
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