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SELECT                                                                                                                
            category,                                                                                                            
            SUM(amount)*-1 AS amount,                                                                                            
            EXTRACT('year' FROM date_transfer) AS year,                                                                          
            EXTRACT('month' FROM date_transfer) AS month                                                                         
            FROM transaction                                                                                                     
            WHERE amount < 0                                                                                                     
            GROUP BY                                                                                                             
                EXTRACT('year' FROM date_transfer) AS year,                                                                      
                EXTRACT('month' FROM date_transfer) AS month                                                                     
            HAVING                                                                                                               
                year = 2010                                                                                                      
                AND month = 1                                                                                                    
            ORDER BY                                                                                                             
                year ASC,                                                                                                        
                month ASC,                                                                                                       
                category ASC;