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Tuple Relational Calculus

By | 2018-07-10T07:14:18+00:00 April 23rd, 2018|Computer Science, DBMS|

This article introduces the language called tuple relational calculus, and another article will feature a variation called domain relational calculus. In both variations of relational calculus, we create one declarative expression to specify a retrieval request; hence, there is no description of how, or in what order, to examine a query. A calculus expression defines [...]

SQL – Structured/Standardized Query Language

By | 2018-07-10T07:14:10+00:00 April 23rd, 2018|Computer Science, DBMS|

The SQL language could be considered among the significant reasons for the commercial success of relational databases. Due to the fact that it ended up being a standard for relational databases, users were less concerned about moving their database applications from various other types of database systems-- for example, older network or hierarchical systems-- to [...]

Relational Algebra and RDBMS

By | 2018-07-10T07:14:24+00:00 April 23rd, 2018|Computer Science, DBMS|

The relational algebra is essential for several reasons. First, it offers a formal structure for relational model operations. Second, and perhaps more important, it is used as a basis for implementing and optimizing queries in the query processing and optimization modules that are important parts of relational database management systems (RDBMSs). Third, some of its [...]

Databases and Database Management System

By | 2018-07-10T07:14:01+00:00 April 23rd, 2018|Computer Science, DBMS|

Databases and database systems are an essential component of life in modern society. Every day most of us perform several activities that involve some interaction with a database. If we go to the bank to deposit or withdraw funds, if we make a hotel or airline company booking, if we access a digital library directory [...]