diff --git a/db/init_db.sql b/db/init_db.sql
index 00a15e8..36fb4fb 100644
--- a/db/init_db.sql
+++ b/db/init_db.sql
@@ -35,15 +35,14 @@ CREATE TABLE IF NOT EXISTS collaborateur(
     Telephone varchar(15) NOT NULL,
     PersonalMail varchar(100) NOT NULL,
     ApsideMail varchar(100) NOT NULL,
-    ResignationDate date,
+    ResignationDate date NOT NULL,
     businessunitId int NOT NUll,
-    ReferrerId int,
+    ReferrerId int NOT NULL,
     CONSTRAINT FK_COLLABORATEUR_BUSINESSUNIT FOREIGN KEY (businessunitId) REFERENCES businessunit(Id),
     CONSTRAINT FK_COLLABORATEUR_PARRAIN FOREIGN KEY (ReferrerId) REFERENCES collaborateur(Id),
     PRIMARY KEY (Id)
 );
 
-
 INSERT INTO agence(Id, Name) VALUES (1,'Clermont-Ferrand');
 INSERT INTO businessunit(Id, Name, agenceId) VALUES (1,'Cournon',1);
 INSERT INTO collaborateur(Name, FirstName, BirthDate, Gender, Status, ChildrenNumber, Address, Telephone, PersonalMail,