=SI(NON(NB.SI(Index!$A:$A;$A9))+ESTVIDE(INDEX(Index!B:B;EQUIV($A9;Index!$A:$A;0)));"";INDEX(Index!B:B;EQUIV($A9;Index!$A:$A;0)))
=ESTTEXTE($A3)*(B3="")
=SI(NB.SI(Index!$A:$A;$A9);INDEX(Index!B:B;EQUIV($A9;Index!$A:$A;0));"")
=ESTTEXTE($A3)*(B3=0)
=SI(NB.SI(Index!$A:$A;$A9);RECHERCHEV($A9;Index!$A:B;COLONNE();0);"")