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                            HAVING方法也是連貫操作之一，用于配合group方法完成從分組的結果中篩選（通常是聚合條件）數據。

having方法只有一個參數，并且只能使用字符串，例如：

~~~
$this->field('username,max(score)')->group('user_id')->having('count(test_time)>3')->select(); 
~~~
生成的SQL語句是：

~~~
SELECT username,max(score) FROM think_score GROUP BY user_id HAVING count(test_time)>3
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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