https://www.labri.fr/perso/hocquard/L2CCASE/Cours/Access.pdf
https://web.maths.unsw.edu.au/~lafaye/CCM/bdd/bddtypes.htmhttps://www.data bird.co/blog/cle etrangere
https://stacklima.com/difference entre la cle primaire et la cle etrangere/
https://www.base de donnees.com/mld/#google_vignette
https://www igm.univ mlv.fr/~chochois/RessourcesCommunes/BDD/Modelisation/coursMLD.pdf
https://louisvandevelde.be/index.php?dos=my&fic=meris
https://www.labri.fr/perso/hocquard/L2CCASE/Cours/Access.pdf