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                            LaravelORM 寫法：
~~~
Orm::withCount['relation'])->get();
~~~
解析成SQL :
~~~
select `a`.*, (select count(*) from `relation` where `a`.`id` = `relation`.`aid`) 
as `relation_count` from `a`;
~~~
當需要統計關聯的 某個字段 sum 時，可以這樣寫：

~~~
Orm::withCount(['relation as relation_sum' =>function($query){
    $query->select(DB::raw("sum(amount) as relationsum");
}])
~~~
解析成SQL:
~~~
select `a`.*, (select sum(amount) from `relation` where `a`.`id` = `relation`.`aid`) 
as `relation_sum_count` from `a` ;
~~~
其他的avg ， max ， min也可以通過withCount實現
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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