diff --git a/EXOS/SOLUTIONS-DS2020/exo1.sql b/EXOS/SOLUTIONS-DS2020/exo1.sql
new file mode 100644
index 0000000..74c7b74
--- /dev/null
+++ b/EXOS/SOLUTIONS-DS2020/exo1.sql
@@ -0,0 +1,41 @@
+drop table tresultat purge;
+create table tresultat(ligne varchar2(200));
+variable vnbRef number
+prompt nombre de référence?
+accept vnbRef
+declare
+dnbRef number:='&vnbRef';
+didRep char(5);
+dmessage varchar2(200);
+dnbTot number;
+inex exception;
+cursor CUR is select I.idRep, sum(nbPlacesRes)
+			from inscription I, representation R
+			where I.idRep=R.idRep
+			and dateRep>sysdate
+			group by I.idRep	
+			having sum(nbPlacesRes) > dnbRef	
+			order by 2 desc;
+begin
+	dmessage:='nombre de reference trop eleve';
+	insert into tresultat values('Id rep     Nb total');
+		open CUR;
+		fetch CUR into didRep, dnbTot;
+		
+		if CUR%notFound then raise inex;end if;
+		while CUR%FOUND
+		loop
+			insert into tresultat values (didRep||'     '||dnbTot);
+			fetch CUR into didRep, dnbTot;
+		end loop;
+		close CUR;
+	exception
+	when inex then insert into tresultat values (dmessage);
+end;
+.
+/
+select * from tresultat;
+
+
+
+
diff --git a/EXOS/SOLUTIONS-DS2020/exo2-q1.pc b/EXOS/SOLUTIONS-DS2020/exo2-q1.pc
new file mode 100644
index 0000000..0297978
--- /dev/null
+++ b/EXOS/SOLUTIONS-DS2020/exo2-q1.pc
@@ -0,0 +1,42 @@
+
+
+int main(int argc, char** argv)
+{
+char vidRep[6]; 
+char vdateRep[11]; 
+char vheureRep[5];
+int vnbPlaces; 
+char vidArtiste[6];
+int fin=1;
+int vnbMax;
+short indic;
+	
+	EXEC SQL WHENEVER SQLERROR DO sql_error("Pb connexion\n");
+	printf("\n Appel de la fonction connexion");
+	connexion();
+	
+	EXEC SQL DECLARE rep CURSOR FOR SELECT idRep, nbplaces FROM representation;
+	EXEC SQL OPEN rep;
+
+	EXEC SQL FETCH rep INTO :vidRep, :vnbPlaces:indic;
+	if (sqlca.sqlcode == +1403) {fin = 0;}
+	while  (fin!=0)
+        {       
+		vidRep[5]='\0';
+		printf("\n num representation: %s \n",vidRep);
+		if (indic==-1)
+			printf("\n nb max?: ");
+			scanf ("%d%*c", &vnbMax);
+			EXEC SQL update representation set nbPlaces = :vnbMax where idRep=:vidRep;
+			EXEC SQL commit;
+		EXEC SQL FETCH rep INTO :vidRep, :vnbPlaces:indic;
+		if (sqlca.sqlcode == +1403) {fin = 0;}
+		}
+      printf(" Fini \n");
+	EXEC SQL CLOSE rep;
+
+	deconnexion(1);
+	return(0);
+}
+
+
diff --git a/EXOS/SOLUTIONS-DS2020/exo2-q2.pc b/EXOS/SOLUTIONS-DS2020/exo2-q2.pc
new file mode 100644
index 0000000..c73cbde
--- /dev/null
+++ b/EXOS/SOLUTIONS-DS2020/exo2-q2.pc
@@ -0,0 +1,57 @@
+
+
+int main(int argc, char** argv)
+{
+char vdateRep[11];
+char vheureRep[6];
+char vidRep[6];
+int vnbPlaces;
+int vnbPlacesRes;
+int vTabNbPlacesRes[500];
+int i, nb, fin=1;
+
+connexion();
+EXEC SQL DECLARE REP CURSOR FOR SELECT to_char(dateRep, 'dd/mm/yyyy'), heureRep, idRep, nbPlaces 
+FROM representation 
+where dateRep>sysdate order by 1, 2;
+
+printf("\n liste des représentations");
+printf("\n dateRep    Heure Rep    Id Rep    Nb places rés./Insc.");
+// traitement curseur pour en tete représentation
+	EXEC SQL OPEN REP;
+	EXEC SQL FETCH REP INTO :vdateRep, :vheureRep, :vidRep, :vnbPlaces;
+	if (sqlca.sqlcode == +1403) {fin = 0;}
+	while  (fin!=0)
+        {       
+		vdateRep[10]='\0'; vheureRep[5]='\0';vidRep[5]='\0';
+		printf("\n %s.....%s......%s\n",vdateRep,vheureRep,vidRep); // en tete rep
+		
+		// gestion détail places
+			EXEC SQL SELECT count(nbPlacesRes)
+			into :nb
+			FROM inscription I, representation R
+			where dateRep>sysdate and R.idRep=I.idRep and I.idRep=:vidRep;
+			
+			vnbPlacesRes=vnbPlaces;
+			if (nb>0){					// si on a des inscriptions
+				EXEC SQL SELECT nbPlacesRes
+				into :vTabNbPlacesRes
+				FROM inscription I, representation R
+				where dateRep>sysdate and R.idRep=I.idRep and I.idRep=:vidRep;
+			for (i=0; i<nb;i++)
+				{
+				printf("\n ................%d\n",vTabNbPlacesRes[i]);	// detail
+				vnbPlacesRes=vnbPlacesRes - vTabNbPlacesRes[i];
+				}
+			printf("\nNombre de places disponibles: %d\n",vnbPlacesRes); // fin rep
+			}
+		EXEC SQL FETCH REP INTO :vdateRep, :vheureRep, :vidRep, :vnbPlaces;
+		if (sqlca.sqlcode == +1403) {fin = 0;}
+		}
+	EXEC SQL CLOSE REP;
+
+	deconnexion(1);
+	return(0);
+}
+
+
diff --git a/EXOS/SOLUTIONS-DS2020/exo2-q3.pc b/EXOS/SOLUTIONS-DS2020/exo2-q3.pc
new file mode 100644
index 0000000..5b81dc8
--- /dev/null
+++ b/EXOS/SOLUTIONS-DS2020/exo2-q3.pc
@@ -0,0 +1,60 @@
+
+
+int main(int argc, char** argv)
+{
+char vidRepAnc[6];
+char vidRepNouv[6];
+varchar vadrMail[30];
+int nb, nb1, nb2, nb3, vnbP,vnbPlacesRes;
+float vtarif, vmont1, vtarif2, vmont2, vdif;
+	connexion();
+	// calcul montant payé pour ancienne rep 
+		EXEC SQL select nbPlacesRes,tarif into :vnbP, :vtarif
+		from inscription I, representation R, artiste A
+		where I.idRep=R.idRep and R.idartiste=A.idaRtiste and I.idRep=:vidRepAnc and adrMail=:vadrMail;
+	// avait payé
+		vmont1=vtarif*vnbP;	
+
+	// inscription deja faite?
+		EXEC SQL SELECT count(*) into :nb
+		FROM inscription 
+		where idRep=:vidRepNouv and adrMail=:vadrMail;
+		if (nb==1)
+				{sql_error("\ninscription déjà faite à cette nouvelle\n");}
+		else {
+		// nombres places suffisantes?
+				EXEC SQL SELECT nbPlaces into :nb1
+				FROM representation 
+				where idRep=:vidRepNouv;
+				
+				EXEC SQL SELECT sum(nbPlacesRes) into :nb2
+				FROM inscription
+				where idRep=:vidRepNouv;
+				
+				EXEC SQL SELECT nbPlacesRes into :vnbPlacesRes
+				FROM inscription 
+				where idRep=:vidRepAnc and adrMail=:vadrMail;
+				// nb places restantes
+				nb3=nb1-nb2-vnbPlacesRes;
+				if (nb3<0) 
+					{sql_error("\nplus assez de places");}
+				else {
+					EXEC SQL select tarif into :vtarif2
+						from representation R, artiste A
+						where R.idArtiste=A.idArtiste and R.idRep=:vidRepNouv;
+		// devrait payer				
+					vmont2=vtarif2*vnbPlacesRes;
+		//maj				
+					EXEC SQL UPDATE inscription set idRep=:vidRepNouv
+					where idRep=:vidRepAnc and adrMail=:vadrMail;
+					EXEC SQL COMMIT;
+		// remboursement?
+					vdif=vmont1-vmont2;
+					if(vdif>0)
+						printf("\nmodif faite, on vous doit: %.2f euros", vdif);
+					else printf("\nmodif faite, vous devez: %.2f euros", vdif*-1);
+					}
+				}
+	deconnexion(1);
+	return(0);
+}