November 2016
Intermediate to advanced
144 pages
3h 36m
Polish
Content preview from Pierwsze kroki z SQL
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Rozdział 8. Operator JOIN
Łączenie ze sobą dwóch tabel
Możliwość wyświetlania danych pochodzących z kilku złączonych tabel jest sztandarową funkcjonalnością języka SQL, która wyróżnia go na tle innych narzędzi do analizy danych. Zanim jednak zaczniesz zgłębiać szczegóły na temat zastosowania operatora JOIN, upewnij się, że jesteś w stanie dość swobodnie posługiwać się zaprezentowanymi dotychczas instrukcjami języka SQL. Jeśli masz co do tego wątpliwości, powtórz jeszcze raz to, czego się do tej pory nauczyłeś, zanim przejdziemy dalej.
Wróćmy na chwilę do początku książki, kiedy to omawialiśmy podstawowe cechy relacyjnych baz danych. Wspomnieliśmy tam między innymi o tym, że w tabelach znajdujących się w znormalizowanych bazach danych występują ...
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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.