
select * from congressiste where n_hotel = 2 or n_hotel = 3 or n_hotel = 4 ; 
select * from activite where date_act = '2013-11-13' or date_act = '2013-11-22' ; 
select * from hotell ORDER BY nom_hotel ASC ; 
select * from activite where prix_activite between 200 and 520 ; 
select nom_congressiste ,prenom_congressiste from congressiste where 
nom_congressiste LIKE'B%' ; 
select * from hotell where nom_hotel LIKE '%a%' ; 
select nom_congressiste ,prenom_congressiste from congressiste where 
nom_congressiste LIKE'%t' ; 
select * from hotell where prix_participation between 35 and 55  and prix_suppl 
between 20 and 30; 
select prix_participation + prix_suppl as total from hotell ; 
select n_congressiste , nom_congressiste,nom_hotel from congressiste ,hotell 
where congressiste.n_hotel =hotell.n_hotel 
select n_congressiste , nom_congressiste,nom_hotel ,nom_org from congressiste 
,hotell , organisme_payeur where congressiste.n_hotel =hotell.n_hotel and 
congressiste.n_org = organisme_payeur.n_organisme; 
select n_congressiste , nom_congressiste,nom_hotel from congressiste ,hotell 
where congressiste.n_hotel =hotell.n_hotel order by nom_hotel asc ; 
select n_congressiste , nom_congressiste,nom_hotel from congressiste ,hotell 
where congressiste.n_hotel =hotell.n_hotel  order by nom_congressiste asc ; 
select n_congressiste , nom_congressiste,nom_hotel from congressiste ,hotell 
where congressiste.n_hotel =hotell.n_hotel  and address_hotel='Blida' order by 
nom_congressiste asc ; 
 
Requêtes par fonction  
select count (*) from congressiste ; 
select avg (prix_participation ) from hotell where address_hotel ='Alger' ; 
select avg (prix_suppl ) from hotell where address_hotel ='Alger' ; 
select n_activite , count (n_cong) as num_cong from participation  
group by (n_activite); 
select n_cong , avg(nbr_personne) as moyenne from participation group by n_cong 
having  count (n_activite) >2  ; 
 
 
Requêtes imbrique 
select nom_congressiste , prenom_congressiste from congressiste where 
n_congressiste in (select n_cong from participation where  n_activite = 3); 
select nom_congressiste , prenom_congressiste from congressiste where 
n_congressiste in (select n_cong from participation , activite where 
participation.n_activite=activite.n_activite and nom_activite != 'toumoi'); 
select nom_congressiste , prenom_congressiste  from congressiste where n_hotel in 
(select n_hotel from hotell  where (prix_participation + prix_suppl) >70 ); 
select nom_congressiste , prenom_congressiste  from congressiste ,participation 
where  congressiste.n_congressiste = participation.n_cong and  n_activite in(select