November 2016
Intermediate to advanced
144 pages
3h 36m
Polish
Content preview from Pierwsze kroki z SQL
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Rozdział 7. Instrukcje ze słowem kluczowym CASE
Wyposażeni w podstawową wiedzę na temat składni języka SQL, powoli możemy zacząć zgłębiać możliwości zastosowania szczególnie użytecznego słowa kluczowego, jakim jest operator JOIN. Zanim jednak przejdziemy do omówienia jego bezspornych zalet, przyjrzyjmy się pokrótce sposobom użycia niezwykle przydatnej instrukcji CASE. Dzięki niej bowiem na podstawie zdefiniowanego warunku lub zestawu warunków logicznych możemy zastąpić wartości w danej kolumnie inną wartością[1].
Składnia instrukcji CASE
Instrukcja języka SQL zawierająca słowo kluczowe CASE pozwala na przypisanie wartościom znajdującym się w wybranej kolumnie w tabeli innych wartości, które spełniają podany w instrukcji warunek lub zestaw warunków ...
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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.