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                            > `groupby`用于對數據集合進行分組，例如：
```php
//查詢訂單表中每個用戶的訂單總額
Db('order')->select([
            'field' => ['SUM(OrderPrice) as Price','userId'],
            'groupby' => 'userId'
        ])->get();
//sql：SELECT SUM(OrderPrice) as Price,`userId` FROM `order` GROUP BY userId;
```
>SQL小技巧：對于查詢頻率高的多數據表，建立字段索引將大大提高查詢速度
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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