Question

I’m new here. I thought I could ask for some help here on my php-sql homework.
I’ve been trying to extract all the sports associated to a registered person using SQL.

There are three tables in my mySql.

personnes which stores the individuals

[id]  [sexe]  [etat_civil]  [nom]    [prenom]
1     Homme    M.           Smith    Alex
2     Femme    Mme          Alisha   Elektra
3     Femme    Mll          Lord     Yves

loisirs which stores the types of sports or leisures

id  nom
1   Sport
2   Concert
3   Jeux vidéo
4   Jeux société
5   Voyage
6   Cinéma
7   Lecture
8   Théâtre
9   Danse
10  Animaux
11  Randonnée
12  Shopping

personnes_loisirs which stores the foreign key of the individuals which associated foreign keys id.

[id]   [fk_personnes]  [fk_loisirs]
1      1                1
2      1                2 
3      1                3
4      2                1
5      2                3
6      2                4
7      2                5
8      3                7
9      3                8
10     3                9

Basically, I’ve been successful to extract the sport of a user but only if there’s only 1 sport associated to him. Where there are more than 1, I fail to get the rest of it.

Here’s the SQL

select nom 
from `loisirs` 
where id in 
  (select fk_loisirs 
   from `personnes_loisirs`    
   where id in 
     (select id 
      from `personnes` 
      where sexe='Homme' AND nom='Smith' AND prenom='Alex'))

This returns me ‘Sport’ but not ‘Sport, Concert and Jeux Vidéo’;

I think I must use JOIN to be able to retrieve all the ‘loisirs’ associated to SmithAlex
But I’m not sure how.

Please help.

Answer 1

select l.nom
from personnes p
join personner_loisirs pl on p.id = pl.fk_personnes
join loisirs l on l.id = pl.fk_loisirs
where p.nom = 'Smith' and p.prenom='Alex'