A parallel adder which is optimal in both delay and size under left-to-right input arrival is proposed. The delay is the computation time after the arrival of the nal input bits. The proposed adder is composed of a carry select adder (CSA) and a small adder based on the on-they conversion (OTFA). Parallel computation in the CSA and the OTFA which make full use of the delay of the input arrival ...

SQL standard provides SQL/XML publishing functions to publish the result of an SQL query as XML values but it does not provide any SQL/XML publishing function that can publish the result of a recursive SQL query as recursively structured XML values. Therefore, to publish transitively connected relational tuples as recursively structured XML values with the use of appropriate SQL/XML publishing ...

Assume that we have an SQL query containing joins and a group by The standard way of evaluating this type of query is to rst perform all the joins and then the group by operation However it may be possible to perform the group by early that is to push the group by operation past one or more joins Early grouping may reduce the query processing cost by reducing the amount of data participating in...

We describe a technique and a tool called Qex for generating input tables and parameter values for a given parameterized SQL query. The evaluation semantics of an SQL query is translated into a specific background theory for a satisfiability modulo theories (SMT) solver as a set of equational axioms. Symbolic evaluation of a goal formula together with the background theory yields a model from w...

RÉSUMÉ. En informatique ambiante, les objectifs de l’utilisateur peuvent émerger opportunément. Il devient, dès lors, nécessaire de savoir générer à la volée des systèmes interactifs. Un système interactif est composé d’un noyau fonctionnel et d’une Interface Homme-Machine (IHM). Cet article traite de la composition d’IHM pour un objectif utilisateur et un contexte d’usage (utilisateur, plate-f...

A simple sql statement can be used to search learning or rule in relational database for data mining purposes particularly for classification rule. With just only one simple sql statement, characteristic and classification rule can be created simultaneously. Collaboration sql statement with any other application software will increase the ability for creating t-weight as measurement the typical...

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In this paper, we present SnipSuggest, a system that provides onthe-go, context-aware assistance in the SQL composition process. SnipSuggest aims to help the increasing population of non-expert database users, who need to perform complex analysis on their large-scale datasets, but have difficulty writing SQL queries. As a user types a query, SnipSuggest recommends possible additions to various ...

Das hier vorgestellte Verfahren ermöglicht die Analyse der Data Provenance von beliebigen SQL-Queries. Von der ebenfalls hier skizzierten Implementierung des Verfahrens werden unter anderem unterstützt: Subqueries, Aggregierungen, rekursive Queries und Window Functions. Eingabequeries werden zunächst in eine imperative Programmiersprache übersetzt. Der Programmcode wird mit einem neuen Verfahre...