November 2016
Intermediate to advanced
144 pages
3h 36m
Polish
Content preview from Pierwsze kroki z SQL
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Rozdział 2. Bazy danych
Czym jest baza danych?
Najszerzej rzecz ujmując, baza danych to miejsce, w którym dane są gromadzone i porządkowane. Bazą danych jest zarówno arkusz kalkulacyjny zawierający informacje o rezerwacjach klientów, jak i zwykły plik tekstowy z rozkładem lotów. Plik taki może być zapisywany w różnych formatach, takich jak na przykład XML czy CSV.
Gdy eksperci branży IT używają pojęcia baza danych, zazwyczaj mają na myśli system zarządzania relacyjną bazą danych (ang. Relational Database Management System — RDBMS). Określenie to może brzmieć dość technicznie i wzbudzać pewien niepokój, jednak system zarządzania bazą danych to nic innego jak pewnego rodzaju baza danych, zawierająca jedną lub wiele tabel, które mogą być ze sobą ...
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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.