diff --git a/banque.sql b/banque.sql
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index 0000000..12c2e1b
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+++ b/banque.sql
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+drop schema bank cascade;
+create schema bank;
+
+/*
+ * Holder : table commune à tous les titulaires
+ */
+create table holder (
+  "id" bigint primary key generated always as identity,          -- identifiant unique
+  "type" text not null check ("type" in ('PERSON', 'COMPANY')),
+  "created_at" timestamp not null default now()                  -- date de création
+);
+
+/*
+ * Person
+ */
+create table person (
+  "id" bigint primary key references holder(id) on delete cascade,
+  "firstname" text not null,
+  "lastname" text not null,
+  "birthdate" date not null
+);
+
+/*
+ * Company
+ */
+create table company (
+  "id" bigint primary key references holder(id) on delete cascade,
+  "name" text not null,
+  "registration_number" text unique not null,
+  "created_at" date not null
+);
+
+/*
+ * Insertion des données
+ */
+
+-- Création d’un titulaire de type personne physique
+insert into holder(type) values ('PERSON') returning id;
+
+-- Utilisons l'id qui est retourné (1)
+insert into person(id, firstname, lastname, birthdate)
+  values (1, 'Françoise', 'Zanetti', '1995-04-12');
+
+-- Création d’un titulaire de type entreprise
+insert into holder(type) values ('COMPANY') returning id;
+
+-- Utilisons l'id qui est retourné (2)
+insert into company(id, name, registration_number, created_at)
+  values (2, 'Boulangerie de Valorgue', 'FR19803269968', '2014-08-19');
+
+/*
+ * Visualisation des données
+ */
+
+-- Liste de tous les titulaires
+create view list_holders as
+select h.id, h.type, h.created_at,
+       p.firstname || ' ' || p.lastname as person,
+       c.name as company
+from holder h
+left join person p on p.id = h.id
+left join company c on c.id = h.id
+order by h.id;
+
+/*
+ * Suppression des données
+ */
+
+insert into holder(type) values ('PERSON') returning id;
+
+insert into person(id, firstname, lastname, birthdate)
+  values (3, 'Lucas', 'Zanetti', '2002-05-09');
+
+select * from person;
+
+delete from holder where id = 3; 
+
+-- La suppresion du titulaire entraine la suppression de l'individu
+select * from person;
+
+-- Contrainte sur l'âge du titulaire
+alter table person
+add constraint chk_person_minimum_age
+check (birthdate <= current_date - interval '15 years');
+
+insert into holder(type) values ('PERSON') returning id;
+
+insert into person(id, firstname, lastname, birthdate)
+  values (3, 'Mattéo', 'Zanetti', '2012-12-12');
+
+/*
+ * Account
+ * Chaque compte a un numéro unique.
+ * La contrainte check (balance >= 0) empêche les soldes négatifs
+ */
+create table account (
+  id bigint primary key generated always as identity,
+  number text unique not null,
+  opened_at date not null default current_date,
+  closed_at date,
+  balance numeric(18,6) not null default 0 check (balance >= 0)
+);
+
+/*
+ * Account -> Holder
+ * Cette table établit la relation n–n entre account et holder.
+ * Un compte joint correspond donc à plusieurs lignes dans cette table.
+ * La contrainte share assure que les parts sont comprises entre 0 et 1.
+ */
+create table account_holder (
+  account_id int not null references account(id) on delete cascade,
+  holder_id int not null references holder(id) on delete cascade,
+  share numeric(4,3) default 1 check (share > 0 and share <= 1),
+  primary key (account_id, holder_id)
+);
+
+/*
+ * Compte individuel pour Françoise Zanetti.
+ */
+
+insert into account (number) 
+  values ('AA') returning id;
+
+insert into account_holder
+  values (1, 1);
+
+/*
+ * Ajout d'un nouveau titulaire : Justin Hébrard né le 11/03/1993.
+ */
+
+insert into holder(type) values ('PERSON') returning id;
+
+insert into person(id, firstname, lastname, birthdate)
+  values (5, 'Justin', 'Hébrard', '1993-03-11');
+
+/*
+ * Compte joint pour Françoise et Justin.
+ */
+
+insert into account (number) 
+  values ('AB') returning id;
+
+insert into account_holder
+  values (2, 1, 0.5);
+
+insert into account_holder
+  values (2, 5, 0.5);
+