execice 1

create or replace function fn_points_fidelite(Id_client Number)
return Number
IS
    V_pt_fidelite number;
Begin
    Select sum(L.prix_total) Into V_pt_fidelite
    from ligne_Commande L, Commande CO
    where L.commande_id = CO.id AND CO.client_id = Id_client;
    V_pt_fidelite := floor(V_pt_fidelite/10);
    return V_pt_fidelite;
Exception
    when No_data_found then
    return 0;
end fn_points_fidelite;

select fn_points_fidelite(16) from dual;


declare
    cursor C_client IS Select id, nom from client;
    V_points number;
Begin
    for v_client in c_client
    loop
        v_points := fn_points_fidelite(v_client.id);
        if (v_points < 2) then
            DBMS_OUTPUT.PUT_LINE(v_client.nom || 'à' || v_points || 'point de fidelité' );
        else
            DBMS_OUTPUT.PUT_LINE(v_client.nom || 'à' || v_points || 'points de fidelités' );
        end if;
    end loop;
end;

//--------------------------------------------------
select nom || 'à' || fn_points_fidelite(id) ||
case
    when fn_points_fidelite(id) < 2 then
        'point de fidelité';
    else
        'points de fidelités';
end
from client;

//---------------!!!!!!!!!!!!!!!!!!!----------------------------



exercice 2

create or replace trigger trg_DeleteCommande
Before delete
on Commande
for each row
begin
    delete from ligne_commande L where L.commande_id = :old.id;
end trg_DeleteCommande;

---------------------verification-----------------------------
select * from Commande CO, ligne_commande L where CO.id = 16 AND CO.id = L.commande_id;

        ID  CLIENT_ID DATE_ACHA REFERENCE                                                                                                                                                                                                                                                               ID COMMANDE_ID PRODUIT_ID   QUANTITE PRIX_TOTAL
---------- ---------- --------- --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ---------- ----------- ---------- ---------- ----------
        16         15 18-JAN-19 008974                                                                                                                                                                                                                                                                  33          16          2          4      400.4

delete Commande where id=16;
select * from ligne_commande L where L.commande_id = 16;
no rows selected




exercice 3

create or replace trigger trg_DeleteClient
Before delete
on Client
for each row
begin
    delete from Commande CO where CO.client_id = :old.id;
end trg_DeleteCommande;


exercice 4

create table Client_His as select * from Client;
delete from Client_His;

create or replace trigger trg_DeleteClient
before delete
on Client
for each row
begin
    delete from Commande CO where CO.client_id = :old.id;
    insert into Client_His values (:old.id, :old.prenom, :old.nom, :old.email, :old.ville);
end trg_DeleteCommande;


exercice 5

la contrainte de suppression en cascade



exercice 6

drop table Client cascade constraints;
drop table Commande cascade constraints;
drop table ligne_commande cascade constraints;

CREATE TABLE client (
    id INT PRIMARY KEY,
    prenom VARCHAR(255),
    nom VARCHAR(255),
    email VARCHAR(255),
    ville VARCHAR(255)
);

CREATE TABLE commande (
    id INT PRIMARY KEY,
    client_id INT,
    date_achat DATE,
    reference VARCHAR(255),
    FOREIGN KEY (client_id) REFERENCES client(id) ON DELETE CASCADE
);

CREATE TABLE ligne_commande (
    id INT PRIMARY KEY,
    commande_id INT,
    produit_id INT,
    quantite INT,
    prix_total DECIMAL(10, 2),
    FOREIGN KEY (commande_id) REFERENCES commande(id) ON DELETE CASCADE,
    FOREIGN KEY (produit_id) REFERENCES produit(id)
);



Exercice 7