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.dsy:it. : Powered by vBulletin version 2.3.1 .dsy:it. > Didattica > Corsi A - F > Basi di dati ~ comunicazione digitale > appello 23/9
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hartman
.precettore.

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appello 23/9

che ne dite?
per me era molto lungo..nel senso che era complesso e quindi 2 ore nn m sn bastate
penso proprio di non averlo passato per la settima volta e m slitterà la laurea :evil: :evil: :evil:

a voi come veniva la normalizzazione?


a me venivano chiavi AB AC e AD
non era in bcnf per b->c e c->d
non era in 3nf

ABCE AB->E B->C AB KIAVE
ACDF AC->F C->D AC KIAVE
ADB AD->B AD KIAVE

23-09-2009 11:32
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Ste Ramone
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perchè non è in 3NF? AB AC e AD sono chiavi, e sono a sx, mentre nelle altre due C e D sono att primi delle chiavi a dx, quindi dovrebbe essere 3nf..

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23-09-2009 13:05
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Olda87
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Anche a me usciva che era in 3NF

23-09-2009 19:04
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s1a2
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Anche a me usciva in 3NF.
Sapete su cosa verte l'orale ?

24-09-2009 10:17
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s1a2
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Trovato qualcosa qui...
http://www.dsy.it/forum/showthread....&threadid=37262

24-09-2009 11:12
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violence!jack
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a me veniva NO in BCNF, e come un babbo mi son messo subito a provare una scomposizione e dopo 20 minuti mi sono accorto che non era richiesta :(.....e SI in 3nf, perchè c'erano sempre chiavi a snx o attributi primi a dx.......mi è puzzato un po ma ricontrollando 20 volte veniva sempre così, sperem....

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24-09-2009 12:14
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Ste Ramone
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si l'unico modo per cui poteva non esserlo è se abbiam sbagliato le premesse, ossia se l'insieme iniziale non era minimale, ma dopo mezzora buttata a provare l'ho considerato tale

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24-09-2009 12:20
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chem
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anche a me veniva in 3nf

Last edited by chem on 26-09-2009 at 12:23

26-09-2009 02:07
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rekotc
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raga ma qualcuno sa qualcosa dei risultati/orali ecc?

28-09-2009 11:53
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Ste Ramone
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nessuna news sul sito, sempre che io stia guardando quello giusto :\

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28-09-2009 11:54
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Elesia
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sono usciti i risultati
http://homes.dico.unimi.it/dbandsec...ti_23-09-09.pdf

una strage, non trovate?? O_O

28-09-2009 22:11
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hartman
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il solito direi, non è assolutamente raro che dai suoi scritti passino una decina d studenti.....! e a me slitta la laurea x sto esame!
grazie perlasca
grazie

28-09-2009 23:34
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Ste Ramone
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ma la visione del compito in cosa consiste? qualcuno ci va?
qualcuno posterebbe la soluzione di come andava fatto?

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30-09-2009 09:14
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txd_distress
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io son stato alla correzione... o meglio: alla visione degli errori del mio compito. sinceramente pensavo di aver fatto peggio, ma in realtà ho sbagliato 3 cose e m'ha bocciato... perlasca l'è bello pignolo!

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30-09-2009 19:18
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