November 2016
Intermediate to advanced
144 pages
3h 36m
Polish
Content preview from Pierwsze kroki z SQL
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Rozdział 4. Polecenie SELECT
Korzystając z baz danych i języka SQL, najczęściej budujemy za jego pomocą odpowiednie instrukcje w celu wyświetlenia interesujących nas danych pochodzących z co najmniej jednej tabeli. Jest to możliwe dzięki zastosowaniu instrukcji SELECT. Służy ona jednak nie tylko do wyszukiwania danych w bazie danych i ich wyświetlania. Wachlarz jej możliwości jest bowiem o wiele szerszy. Czytając kolejne rozdziały, dowiesz się, jak za pomocą tej instrukcji przekształcać dane oraz jak wykonać podsumowanie wartości z milionów rekordów w bazie danych.
Najpierw jednak przyjrzyjmy się, w jaki sposób za pomocą instrukcji SELECT wyświetlić kolumny z danej tabeli, a także jak budować wyrażenia, modyfikując zwracane z nich wartości. ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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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.