diff --git a/COURS/C-exo4.sql b/COURS/C-exo4.sql
new file mode 100644
index 0000000..9dff853
--- /dev/null
+++ b/COURS/C-exo4.sql
@@ -0,0 +1,36 @@
+CREATE TABLE tLigne(
+    designation VARCHAR2(500)
+);
+
+set echo off
+set verify off
+set feed off
+
+variable vnoP CHAR(5)
+variable vql NUMBER
+PROMPT Entrer le num du prod :
+ACCEPT vnoP
+PROMPT Entrer la quantitée livré :
+ACCEPT vql
+
+DECLARE
+dCo NUMBER;
+
+BEGIN
+
+SELECT stock INTO dCo
+FROM tProduit
+WHERE noprod = '&vnoP';
+dCo:= dCo + &vql;
+UPDATE tProduit SET stock = dCo WHERE noprod = '&vnoP';
+
+EXCEPTION
+when no_data_found then
+insert into Tligne values('référence inconnue');
+end;
+.
+/
+
+set echo on
+set verify on
+set feed on