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  1. SELECT niveau.niveaucode, niveau.omschrijving, COUNT(genrenaam) AS AantalKlassiek
  2. FROM Niveau RIGHT OUTER JOIN Stuk ON niveau.niveaucode = stuk.niveaucode
  3. WHERE Stuk.genrenaam = 'klassiek'
  4. GROUP BY Niveau.niveaucode, niveau.omschrijving
  5.  
  6. niveaucode  omschrijving    AantalKlassiek
  7. NULL        NULL        2
  8. A       beginners   1
  9. B       gevorderden 3
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