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Feb 26th, 2020
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PL/SQL 0.15 KB | None | 0 0
  1. SELECT AVG(O.OCENA), P.NAZWA  FROM OCENA O, ZAJECIA Z, PRZEDMIOT P
  2. WHERE O.ID_ZAJECIA = Z.ID_ZAJECIA AND Z.ID_PRZEDMIOT=P.ID_PRZEDMIOT
  3. GROUP BY  P.NAZWA
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