Data warehousing and on-line analytical processing (OLAP) are essential elements of
decision support, which has increasingly become a focus of the database industry. Many …

The problem of answering queries using views is to find efficient methods of answering a
query using a set of previously defined materialized views over the database, rather than …

Data integration is the problem of combining data residing at different sources, and
providing the user with a unified view of these data. The problem of designing data …

Apache Calcite is a foundational software framework that provides query processing,
optimization, and query language support to many popular open-source data processing …

In this paper, we address the problem of finding frequent itemsets in a database. Using the
closed itemset lattice framework, we show that this problem can be reduced to the problem …

• Bases de datos relacionales (Capítulos 4 al 7). El Capítulo 4 se centra en el lenguaje
relacional orientado al usuario de mayor influencia: SQL. El Capítulo 5 cubre otros dos …

1. OBJECTIVE Them has been cxtensivc work in query optimization since the enrly '70s. It is
hard to capture the breadth and depth of this large body of work in a short article. Therefore, I …

5,584,024 A 12/1996 Schwartz....................... 707/4 are to be grouped by a? rst Set of one or
more Columns' 5,734,884 A* 3/1998 Eberhard et aL _ 707/200 Where the materialized vieW …

Data integration is a pervasive challenge faced in applications that need to query across
multiple autonomous and heterogeneous data sources. Data integration is crucial in large …

We witness a rapid increase in the number of structured information sources that are
available online, especially on the WWW. These sources include commercial databases on …