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2017 MOED A Q2

+2 votes
19 views
רציתי לשאול על מבחן 2017 מועד א, שאלה 2 סעיף א , תת סעיף 3

רוצים פירוק 3NF שמשמר תלויות

אבל זה נראה שמה שעשו בתשובות לא משמר תלויות

כי התלות

BC to DG

לא נשמרת

לא ככה?
asked Feb 4, 2018 by tikitak (2,970 points)
I think it's ok because you have B,C --> G preserved,
and it's ok that B,C --> D is 'lost' because it is trivially deduced from B --> D, which is preserved.
But it is unclear, and I would like to hear an official answer on this too.
אשמח גם להסבר על שמירות התלויות

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