Thinkphp5 multi table associative query method join queries two database tables, and the query results are spliced and returned

Database only

Want to achieve ：

Code up ：

public function demo()
  {
    
    // With shop Main table 
    $res = Db::table('shop')
      ->alias("a") // Take an alias 
      // And shop_class Tables are associated , The name i, also a Tabular shop_class Field equals i Tabular class_code Field 
      // Table 1 and table 2 are the same ：'a.shop_class = i.class_code'
       ->join('shop_class i', 'a.shop_class = i.class_code')
->field('a.id,a.shop_name,a.shop_price,a.shop_details,i.class_name,a.shop_src,a.shop_xq_src1,a.shop_xq_src2,a.shop_xq_src3,a.good_unit,a.good_parameter,a.good_specs_code')
      // Query required fields field()
      ->select();
      //->paginate(10);// If you need to add this paragraph by page 
   var_dump($res);
  
}