Query below perhaps? I would also recommend changing the where clause as shown for couple of reasons.-- If you don't want to group by Cliente,-- remove it from the select list and the group by list. SELECT pa.nome AS Cliente, DATEADD(mm, DATEDIFF(mm, 0, pa.pdata), 0) AS [FirstOfMonth], AVG(mh.moh) AS 'Média Horas Serviço 3M', AVG(mh.deh) AS 'Média Kms Deslocação 3M'FROM pa JOIN sn ON pa.snno = sn.snno JOIN mh ON mh.nopat = pa.nopatWHERE sn.snno <> 0 AND pa.pdata >= DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) -4, 0) AND pa.pdata < DATEADD(mm, DATEDIFF(mm, 0, GETDATE()), 0)GROUP BY pa.nome, DATEADD(mm, DATEDIFF(mm, 0, pa.pdata), 0)