November 2016
Intermediate to advanced
144 pages
3h 36m
Polish
Content preview from Pierwsze kroki z SQL
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Rozdział 9. Projektowanie baz danych
Planowanie projektu bazy danych
Dotychczas prezentowaliśmy jedynie sposoby wybierania danych z bazy danych za pomocą instrukcji SELECT. Dokonywaliśmy pewnego rodzaju analizy danych, wyświetlając informacje znajdujące się w bazie danych, niejednokrotnie stosując ciekawe przekształcenia. Żadne z tych działań nie polegało jednak na modyfikowaniu danych znajdujących się w tabelach, instrukcja SELECT służy bowiem jedynie do odczytu danych. Czasem jednak może wystąpić potrzeba utworzenia nowej tabeli za pomocą słowa kluczowego CREATE bądź wstawienia, modyfikacji, a nawet usunięcia wierszy. Do tego celu posłużą nam wówczas polecenia INSERT, UPDATE i DELETE.
Jeśli kiedykolwiek staniesz przed wyzwaniem dodania nowej ...
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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.