November 2016
Intermediate to advanced
144 pages
3h 36m
Polish
Content preview from Pierwsze kroki z SQL
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Rozdział 5. Klauzula WHERE
W kolejnych rozdziałach będziemy dodawali do instrukcji SELECT coraz to inne elementy. Jednym z nich jest bardzo często wykorzystywana klauzula WHERE, która na podstawie określonych kryteriów umożliwia wybór odpowiednich wierszy.
Poznamy też więcej funkcji oraz sposobów ich zastosowania nie tylko w klauzuli WHERE, ale również w instrukcji SELECT, o czym wspominano w poprzednim rozdziale. W większości przypadków zarówno wyrażenia, jak i funkcje mogą być umieszczane w dowolnej sekcji zapytania SQL.
Filtrowanie rekordów
W tym rozdziale będziemy pracować na danych pochodzących z innej bazy danych, a mianowicie weather_stations. Dodaj tę bazę danych w oknie podglądu struktury bazy danych (jeśli nie pamiętasz, jak to zrobić, ...
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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.