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Ajutor SQL

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Salut baieti. Am nevoie si eu de ajutorul vostru : detin 3 fisiere .db (care am inteles ca sunt specifice SQL) care contin intrebari si raspunsuri. As vrea sa le unesc cele 3 .db intr-una singura insa exista o micuta problema : una are 38.000 de intrebari si raspunsuri , alta 36.000 , alta 35.000 (si cred ca 31.000 sunt comune la fiecare) . Ma poate ajuta cineva sa le unesc cele 3 dburi fara sa apara dubluri (adica doar intrebarile si raspunsurile distincte sa fie intr-una din cele 3 baze de date) . Multumesc.

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