How to select with joins

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hi,
i have this database in oracle:

ELEVES(NUM_ELEVE, NOM, PRENOM, DATE_NAISSANCE, POIDS, ANNEE)
COURS(NUM_COURS, NOM, NBHEURES, ANNEE)
PROFESSEURS(NUM_PROF, NOM, SPECIALITE, DATE_ENTREE, DER_PROM, SALAIRE_BASE, SALAIRE_ACTUEL)
ACTIVITES (NIVEAU,NOM , EQUIPE)

RESULTATS(NUM_ELEVE, NUM_COURS, NOTE )
CHARGE(NUM_PROF, NUM_COURS)
ACTIVITES_PRATIQUEES(NUM_ELEVE, NIVEAU, NOM)

I need to select name of 'professeurs' who 'charge' all 'cours' of 'annee' 2

What I have tried:

i don't have a solution.

Posted 5-Dec-16 13:40pm

Mohammed-cd7

Updated 5-Dec-16 15:53pm

PIEBALDconsult

v2

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CHill60 5-Dec-16 19:49pm

And what have you tried so far?

Mohammed-cd7 5-Dec-16 20:25pm

i select name of 'professeurs' who 'charge' 'cours' of annee 2, but i need only name of professeurs who 'charge' all 'cours' of annee 2

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Peter Leow · Answer 1 · 2016-12-05T15:53:00

Since you can select names of professors who teach course of year 2, I assume you already know how to SQL JOIN.
If I understand you correctly, you want names of those professors who ONLY teach year 2, that is to exclude any one who teaches other years even if he also teaches year 2. The pseudo sql code is like this:

SELECT professor_name
FROM multiple table join
WHERE NOT EXISTS(
  SELECT professor_name FROM multiple table join
  WHERE year = 1 and year = 3...
) AND year = 2

You may use NOT IN. Google for some reference online.