Applications of Logic Databases
12/2012 · The Springer International Series in Engineering and Computer Science 296. kniha · Springer Science & Business Media
E‑kniha
280
Počet strán
reportHodnotenia a recenzie nie sú overené Ďalšie informácie
Táto e‑kniha
The premise behind developing powerful declarative database languages is compelling: by enabling users to specify their queries (and their integrity constraints) in a clear, non-operational way, they make the user's task easier, and provide the database system with more opportunities for optimization. Relational database systems offer a striking proof that this premise is indeed valid. The most popular relational query language, SQL, is based upon relational algebra and calculus, i.e., a small fragment of first-order logic, and the ease of writing queries in SQL (in comparison to more navigational languages) has been an important factor in the commercial success of relational databases. It is well-known that SQL has some important limitations, in spite of its success and popUlarity. Notably, the query language is non-recursive, and support for integrity constraints is limited. Indeed, recognizing these problems, the latest standard, SQL-92, provides increased support for integrity constraints, and it is anticipated that the successor to the SQL-92 standard, called SQL3, RECURSIVE UNION operation [1]. Logic database systems have will include a concentrated on these extensions to the relational database paradigm, and some systems (e.g., Bull's DEL prototype) have even incorporated object-oriented features (another extension likely to appear in SQL3).
Ohodnoťte túto elektronickú knihu
Povedzte nám svoj názor.
Informácie o dostupnosti
Smartfóny a tablety
Nainštalujte si aplikáciu Knihy Google Play pre Android a iPad/iPhone. Automaticky sa synchronizuje s vaším účtom a umožňuje čítať online aj offline, nech už ste kdekoľvek.
Laptopy a počítače
Audioknihy zakúpené v službe Google Play môžete počúvať prostredníctvom webového prehliadača v počítači.
Čítačky elektronických kníh a ďalšie zariadenia
Ak chcete tento obsah čítať v zariadeniach využívajúcich elektronický atrament, ako sú čítačky e‑kníh Kobo, musíte stiahnuť príslušný súbor a preniesť ho do svojho zariadenia. Pri prenose súborov do podporovaných čítačiek e‑kníh postupujte podľa podrobných pokynov v centre pomoci.
