SELECT  
YEAR(EVT_TARGET) anno, 
MONTH(EVT_TARGET) mese,
UCO_DESC descr,

Sum(
   cast(
      datediff(
         mi,
         (select T2.prv_dvalue from R5PROPERTYVALUES AS T2 where (T2.PRV_PROPERTY = 'UTNCIN' AND T2.prv_code = T1.prv_code)),
         (select T3.prv_dvalue from R5PROPERTYVALUES AS T3 where (T3.PRV_PROPERTY = 'UTNCOUT' AND T3.prv_code = T1.prv_code))
      )
   as float (2))/60
) as SommaOre

FROM 
R5EVENTS
INNER JOIN 
R5PROPERTYVALUES T1
ON PRV_CODE = EVT_CODE
INNER JOIN 
R5UCODES
ON UCO_CODE = EVT_JOBTYPE

WHERE 
(EVT_JOBTYPE = 'UTNTS' or  EVT_JOBTYPE = 'UTNST' or EVT_JOBTYPE = 'UTNSU') 
and
EVT_TARGET >= DATEADD (day, -366, GETDATE()) 
and 
EVT_TARGEt >= '2013-01-05 00:00:00.000' and EVT_TARGEt <= '2013-31-05 00:00:00.000'

GROUP BY 
YEAR(EVT_TARGET), 
MONTH( EVT_TARGET ), 
UCO_DESC, T1.PRV_code

order by  
YEAR(EVT_TARGET) asc, 
MONTH(EVT_TARGET)