如何在php MYSQL中选择具有类别名称的子类别项目

Question

这是我使用 yii 框架的代码。

如何为 Category 表显示所有带有 category_name 的子类别？

[这是包含项目的类别表][1]

[这是子类别表，其中包含类别表中具有 cat_id 和merchant_id 的商品][2]

[这就是我希望它显示的内容，但我不知道如何从类别表中获取 category_name][3]

[https://i.stack.imgur.com/ZZlrx.png][1]

[https://i.stack.imgur.com/XKyhb.png][2]

Name                        Categery Name   

1. 子猫测试-----------------类别名称 - 不显示

2. 子类别 2 测试---------------类别名称 - 不显示

   public function subCategoriesList()
       {
   
       $mtid=Yii::app()->functions->getMerchantID();
       $slug=$this->data['slug'];
       $stmt="
       SELECT sub_id, cat_id, merchant_id, sub_category_name FROM
       {{sub_categories}}
       WHERE
       merchant_id='".Yii::app()->functions->getMerchantID()."'
       ORDER BY cat_id DESC
       ";
       $connection=Yii::app()->db;
       $rows=$connection->createCommand($stmt)->queryAll();            
       if (is_array($rows) && count($rows)>=1){
           foreach ($rows as $val) {        
   
   
               /*$date=date('M d,Y G:i:s',strtotime($val['date_created']));                    
               $date=Yii::app()->functions->translateDate($date);*/
               $date=FormatDateTime($val['date_created']);
   
               if (!empty($val['photo'])){
                   $img=Yii::app()->request->baseUrl."/upload/$val[photo]";
                   $photo="<img class=\"uk-thumbnail uk-thumbnail-mini\" src=\"$img\" >";  
               } else $photo='';
   
   
   
                           $cat_id=Yii::app()->functions->getCategories(1);
   
   
               $feed_data['aaData'][]=array(
                 $chk,stripslashes($val['sub_category_name']).$option,
                 stripslashes("Category Name - Not Showing"),
   
   
                 $photo,
                 "$date<br/><span class=\"tag ".$val['status']."\">".t($val['status'])."</span>"
               );
           }
           $this->otableOutput($feed_data);
       }           
       $this->otableNodata();
   }
   

Answer 1

$stmt="SELECT * 
FROM {{sub_categories}} 
LEFT JOIN {{category}} ON 
{{sub_categories}}.cat_id={{category}}.cat_id
 WHERE
 {{sub_categories}}.merchant_id={{category}}.merchant_id
ORDER BY {{sub_categories}}.cat_id DESC";