July 2011
Intermediate to advanced
450 pages
11h 38m
French
Content preview from Programmer avec MySQL
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Chapitre 4
Interrogation des données
Ce chapitre traite de l’aspect le plus connu du langage SQL qui concerne l’extraction des données par requêtes (nom donné aux instructions SELECT). Une requête permet de rechercher des données dans une ou plusieurs tables ou vues, à partir de critères simples ou complexes. Les instructions SELECT peuvent être exécutées dans l’interface de commande (voir les exemples de ce chapitre) ou au sein d’un programme SQL (procédure cataloguée), PHP, Java, C, etc.
Généralités
L’instruction SELECT est une commande déclarative (elle décrit ce que l’on cherche sans expliquer le moyen d’opérer). À l’inverse, une instruction procédurale (comme un programme) développerait le moyen pour réaliser l’extraction de données (comme ...
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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.