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Ηγλώσσα SQLcs.uoi.gr/~pitoura/courses/db/db02/slides/sql-part1.pdf · 1, Α 2, .., Α n from R1, R2, … Rm where P πA 1, A2, .., An (σ P (R 1 x R 2 x … R m)) where αντιστοιχεί
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