Mysql codeigniter php asc desc order by count结果使用php
我有三个表名为: at\u类别:Mysql codeigniter php asc desc order by count结果使用php,php,mysql,codeigniter,codeigniter-2,Php,Mysql,Codeigniter,Codeigniter 2,我有三个表名为: at\u类别: No.Of.Shops (ASC) (Desc) Category Name (ASC) (Desc) 3 Electronic Shops 1 Ice cream Shops 猫咪 名字 在分类法中: No.Of.Shops (ASC) (Desc) Category Name (ASC) (Desc) 3
No.Of.Shops (ASC) (Desc) Category Name (ASC) (Desc)
3 Electronic Shops
1 Ice cream Shops
No.Of.Shops (ASC) (Desc) Category Name (ASC) (Desc)
3 Electronic Shops
1 Ice cream Shops
No.Of.Shops (ASC) (Desc) Category Name (ASC) (Desc)
3 Electronic Shops
1 Ice cream Shops
at_category
表中命名为电子商店的类别,其值将存储在at_category\u分类法
表中,并且该类别id在at_shop
表中有两个商店。与其他类别aaa、bbb、ccc等相同。可能有一个或两个店铺,或者零个店铺
例如:
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)
________________________________
现在:类别电子商店有3个商店,冰淇淋店有1个商店
预期输出:
No.Of.Shops (ASC) (Desc) Category Name (ASC) (Desc)
3 Electronic Shops
1 Ice cream Shops
当我单击“车间数量”列中的asc订单时,输出将为
No.Of.Shops (ASC) (Desc) Category Name (ASC) (Desc)
1 Ice cream Shops
3 Electronic Shops
这也是类别名称的虎钳诗句
现在,我想通过使用codeigniter按desc订单计数店铺数量来显示结果。不确定这是否是最佳做法。如果数据库中有大量数据,也可能不太好。但我想建议 1.将类别ID放入一个数组中 2.为每个类别按如下方式连接表。(对数组使用foreach循环) 在上面的代码中,
$this->db->where
('at_category',从数组中获取ID)
3.$query
是每个类别的结果
4.每个类别的店铺数量可作为:
$numberOfShos = $query->num_rows();
选择电子邮件,通过电子邮件将(*)从订单组计算为c
$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();
你能举个清楚的例子吗?我的意思是在3个表中显示一些数据。因此,我们可以理解并帮助您。在您的表格“at_shop”中,“shop_category”实际上是“shop_category_name”或“shop_category_id”?@kumar_v请查看编辑的段落并让我知道