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Databases Illuminated, 4th Edition
book

Databases Illuminated, 4th Edition

by Catherine M. Ricardo, Susan D. Urban, Karen C. Davis
March 2022
Intermediate to advanced content levelIntermediate to advanced
682 pages
22h 58m
English
Jones & Bartlett Learning
Content preview from Databases Illuminated, 4th Edition

4.5 Relational Data Manipulation Languages (DMLs)

There are a variety of languages, called relational data manipulation languages (DMLs) used by relational database management systems to manipulate and/or modify data in the database.

4.5.1 Categories of DMLs

Some DMLs are procedural or proscriptive, meaning the user tells the system exactly how to manipulate the data. Relational algebra is an example of a procedural language that we will discuss. Others are nonprocedural or declarative, which means the user states what data is needed but not exactly how it is to be located. Relational calculus and SQL are nonprocedural languages. Some languages are graphical, allowing the user to give an example or illustration of what data should be found. ...

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Publisher Resources

ISBN: 9781284231595