à la restitution ID First Name Last Name 1 Jean Dupont 2 John Doe USER ID Name 10 licence A 20 master B 30 licence C DIPLOMA User ID Diploma ID 1 10 1 20 2 30 USER_DIPLOMA
la performance en lecture User ID First N. Last N. Dipl. ID 1 Dipl. Name 1 Dipl. ID 2 Dipl. Name 2 1 Jean Dupont 10 licence A 20 master B 2 John Doe 30 licence C null null USER