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- SELECT nazwa FROM dostawca d NATURAL JOIN ksiazka k NATURAL JOIN ksiazka_tematyka kt NATURAL JOIN tematyka t
- where tematyka = 'TEMATYKA4' GROUP BY nazwa
- having count(*) = (select count(id_ksiazki)
- from ksiazka k, dostawca d
- where d.id_dostawcy = k.id_dostawcy);
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