Ver originalSELECT usr, FORMAT(SUM(TABLA1.importe)-(Select Sum(TABLA2.importe) From TABLA2 Where TABLA2.usr = 'x' AND MONTH(TABLA2.fecha) = 'y'),2) AS TOTALFROM TABLA1WHERE TABLA1.usr = 'x'AND MONTH(TABLA1.fecha) = 'y'GROUP BY usr;