Solved, thanks guy.
final search :
| multisearch [ search index="xxx" sourcetype="xxx_Recherche" | where NB_Resultat = 0 | rename NB_Resultat as SZERO ] [ search index="xxx" sourcetype="xxx_Recherche" | where NB_Resultat > 0 | rename NB_Resultat as AZERO ] | stats count(AZERO) as totalsearch, count(SZERO) as totalfailed by Resultat | eval wresult=round(totalfailed/(totalfailed+totalsearch)*100,0) | eval ctotal=totalfailed+totalsearch | eventstats sum(ctotal) as sum_ctotal | eval Un=round(ctotal/sum_ctotal*100,0) | eval Recherches=case(Resultat="null","Cadas (U".Un."%)",Resultat="EXACT","Exact (U".Un."%)",Resultat="APPROXIMATIF","Approximatif (U".Un."%)") | table Recherches,totalsearch,totalfailed, ctotal, wresult | eval zresult=tostring(wresult) + "%" | addcoltotals labelfield=Recherches label=TOTAL | rename totalsearch as "Résultats trouvés", totalfailed as "Rien", zresult as "Recherches sans résultat", ctotal as TOTAL | fields - wresult | eval "Recherches sans résultat"=if(like(Recherches,"TOTAL"),round((Rien/TOTAL),2)*100,round(Rien/TOTAL*100,0))
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