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View Code? Open in Web Editor NEWA collection of ER-model examples
A collection of ER-model examples
Zakaj? Zato, ker bo za neko naročilo najprej izdan predračun. Ko bo predračun plačan, se izda dobavnica in avansni račun. Torej dobavnica se ne izda takoj ob naročilu.
Model v obstoječi obliki dopušča samo plačilo po povzetju.
Glede na to da je predračun stalna praksa spletnih trgovin, bi bilo smiselno dodati entiteto Predracun.
Če želimo omogočiti možnost nakupovanja "gostom" (neregistriranim uporabnikom), potem je potrebno shraniti kontaktni e-mail (za pošiljanje predračunov in računov).
Ena možnost je, da obesimo atribut kontaktni_mail
na Narocilo
.
Drugo možnost je, da za vsakega gosta ustvarimo novega uporabnika z avtomatsko generiranim uporabniškim imenom in vnešenim mailom. Druge atribute pustimo prazne.
Ena možnost je ta, da je id_dobavnice
opcijski atribut v tabeli Racun, v katero dodamo id_narocila
.
Tabeli Racun
dodaj rok_placila
Tabeli CenikIzdelkov
dodaj popust
.
Odstrani zalogo; povej da je treba podatek pridobiti iz WMS-ja.
Kategorijo lahko pustiš kot opombo, ker bi za to potreboval še najmanj eno dodatno tabelo (Katergorije), kar bi
po nepotrebnem zakompliciralo model.
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