Object Query Language

Object Query Language est une extension du langage SQL pour base de données orientée objet, langage de requête utilisé pour interroger des SGBDO, normalisé par l'ODMG[1].

Ce langage est typé (les requêtes retournent des objets), et utilise les règles du polymorphisme.

Exemple

Moyenne de la capacité de la RAM des PC de la base, par constructeur : 

SELECT manufacturer, AVG(SELECT part.pc.ram FROM partition part)
FROM PCs pc
GROUP BY manufacturer: pc.manufacturer;

Références

  1. ↑ (en) Edited by R. G.G. Cattell, Douglas K. Barry, Mark Berler, Jeff Eastman,David Jordan, Craig Russell, Olaf Schadow, Torsten Stanienda, and Fernando Velez, The Object Data Management Standard: ODMG 3.0, Morgan Kaufmann, (ISBN 1-55860-647-5)

Voir aussi

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