July 2021
Intermediate to advanced
336 pages
10h 56m
Polish
Content preview from Wprowadzenie do SQL
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Dodatek A Diagram związków encji przykładowej bazy danych
Na rysunku A.1 zamieściłem tzw. diagram związków encji (ang. entity-relationship model) dla przykładowej bazy danych użytej w książce. Zgodnie z nazwą diagram pokazuje encje (tabele) zdefiniowane w bazie danych oraz relacje klucza zewnętrznego między tabelami. Oto kilka użytecznych informacji, dzięki którym łatwiej zrozumieć notację zastosowaną w przedstawionym diagramie:
- Każdy prostokąt reprezentuje tabelę. Nazwa tabeli znajduje się w lewym górnym rogu prostokąta. Najpierw są wymienione kolumny klucza podstawowego, a później pozostałe kolumny.
- Linie znajdujące się między tabelami reprezentują relacje klucza zewnętrznego. Oznaczenia po obu stronach linii wskazują dozwolone ilości: zero ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.