E.F. Codd. A database sublanguage founded on the relational calculus. ACM SIGFIDET, pages 35--61, 1971. Home/Search Document Not in Database Summary Related Articles Check |
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Researching System Administration - Anderson (Correct)
....failures in the cluster and our software. Third, we explain how we increase data scalability. Fourth, we explain how we display the statistics and information from hundreds of machines. 3.1. 1 Overview We make CARD flexible and extensible by gathering and storing the data in relational tables [Cod71] Because the tables use named columns, old programs do not have to change as new types of data are added. Our prototype uses SQL [CAE 76] to access the data, so in addition to providing data for the visualization applet, administrators can execute ad hoc queries. The column names help ....
Edgar F. Codd. A Database Sublanguage Founded on the Relational Calculus. In Proceedings of the 1971 ACM-SIGFIDET Workshop on Data Description, Access and Control, pages 35--68, Nov 1971.
Implementation of Nested Relations in a Database Programming Language - He (1997) (2 citations) (Correct)
....1.1.1 Operations on Relations Operations on relations form the relational algebra, and can be thought of as a collection of methods for building new tables that constitute answers to queries. Codd defined a set of relational operations and proved that they are relationally complete 1 [Cod72]. Relations are considered atomic objects in the relational algebra, and access to tuples within a relation is precluded. Thus the notation and manipulations that must be done are greatly simplified [Mer84] The operations are defined as following: ffl unary operations projection ....
....of the comparing groups are accepted if the specified set comparison on the join attributes is satisfied. There are five oe joins: ffl sup or div or gejoin, the superset operator, a generalization of . div stands for division , which extends Codd s definition of relational division [Cod72]. ffl sub or lejoin, subset, a generalization of . ffl eqjoin, equal set, a generalization of = ffl sep, intersection empty, a generalization of ffi. ffl icomp, intersection not empty, a generalization of 6 ffi . Considering the two relations Student and Class in Figure 2.5. Student ....
E. F Codd. A Data Base Sublanguage Founded on the Relational Calculus. Proceedings of 1971 ACM SIGFIDET Workshop on Data Description, Access and Control.
The Cube Data Model: A Conceptual Model and Algebra for.. - Datta, Thomas (1999) (Correct)
....model has gained widespread acceptance and is the underlying data model for many commercial DBMS s. In addition, operations models have been developed for the relational data model. These models include the relational algebra [6] which is a procedural language, and the tuple relational calculus [7, 8] and the domain relational calculus [23, 20] which are declarative languages. There is very little work in creating data and operations models for multidimensional databases. We are aware of three papers in the published literature which tackle this issue. All of these are quite recent, the ....
E. Codd. A data base sublanguage founded on the relational calculus. In Proc. ACM SIGFIDET Workshop on Data Description, Access, and Control, November 1971.
Negation in Logic and Deductive Databases - Wang (1999) (Correct)
....one of central problems in the deductive approach, that is the problem of negation, which is closely related to nonmonotonic reasoning. 4. 1 From Relational to Deductive Databases In the area of database theory, the relational model, introduced by Codd in 1970s in a series of papers [26] [27], 29] 28] 30] has become dominant. As its name suggests, the model has relations as its data structures. Based upon relational algebra or the equivalent relational calculus, manipulation of data in a relational database is a model theoretic process (see [77] and [92] the database is ....
E. F. Codd. A database sublanguage founded on the relational calculus. In ACM SIGFIDET Workshop on Data Description, Access, and Control, pages 35--61, San Diego, California, 1971.
The Relational Database Theory of Bayesian Networks - Butz (2000) (Correct)
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E.F. Codd. A database sublanguage founded on the relational calculus. ACM SIGFIDET, pages 35--61, 1971.
The Entity-Relationship Model--Toward a Unified View of Data - Peter Pin-Shan Chi (1976) (40 citations) (Correct)
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CODD, E.F. A data base sublanguage founded on the relational calculus. Proc. ACM-SIGFIDET
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