SELECT t_rec.nature, t_rec.sc_main, Format(Val(Day([deb])),"00") AS [jours rec], DCount("*","t_rec","[sc_main] ='" & [Forms]![TR jours par Service]![sc_cbo] & "'") AS NR, Month([deb]) AS Expr1, Format(Val(Month([deb])),"00") AS Expr1, Sum(DateDiff('h',[deb],[fin])) AS TR
FROM t_rec
GROUP BY...