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- Database Functions (VCSU-MEP)

proposed that each DBMS should offer a number of services Each of these is covered in one of the following exhibits with the presentation covering all of them Links Data Storage and Retrieval User accessible Catalog Transaction Support Concurrency Support

Original URL path: http://euler.vcsu.edu:7000/16918/ (2013-06-13)

Open archived version from archive - The Three Great Database Models (VCSU-MEP)

This lesson examines some of the history with particular focus on the three great models proposed for a databases These include the Network Heirarchical and Relational models All of these are significant and have been commercially implemented although the Relational

Original URL path: http://euler.vcsu.edu:7000/16921/ (2013-06-13)

Open archived version from archive - Why is Database Important? (VCSU-MEP)

need to be considered in this lesson We will see the importance of database technology when we compare how we used to do this kind of processing and see how labor intensive it was Links How did we used to

Original URL path: http://euler.vcsu.edu:7000/17149/ (2013-06-13)

Open archived version from archive - Definitions (VCSU-MEP)

relational model comes from the mathematical concept of a relation This and many other such terms are defined in the following exhibits Links Relation Tuple Attribute Schema Body Degree Cardinality

Original URL path: http://euler.vcsu.edu:7000/17237/ (2013-06-13)

Open archived version from archive - The Relational Algebra (VCSU-MEP)

tables and produces a new relation or table The degree and cardinality of the new relation may be the same or different from those of the original relation s When we have complicated expressions like 3 4 2 5 2 the output of most of these operations is immediately used as the input of another The same is true in the Relational Algebra we often compute tables that are used

Original URL path: http://euler.vcsu.edu:7000/17240/ (2013-06-13)

Open archived version from archive - The Relational Calculus (VCSU-MEP)

Calculus Tuple Relational Calculus TRC and Domain Relational Calculus DRC We see elements of both the Relational Algebra and Relational Calculus in SQL Microsoft Access demonstrates Query by Example which is a form of Relational Calculus Since the symbols of

Original URL path: http://euler.vcsu.edu:7000/17243/ (2013-06-13)

Open archived version from archive - The System Catalog (VCSU-MEP)

the system catalog The system catalog contains metadata data that describes other data Typically the metadata of a network or hierachical database is built into the support programs thus it is not as accessible as it is in relational databases

Original URL path: http://euler.vcsu.edu:7000/17246/ (2013-06-13)

Open archived version from archive - An Introduction to SQL (VCSU-MEP)

in the next exhibit that introduces SQL with an example The topics covered include some history of the language the two basic parts of the language and a comparison query

Original URL path: http://euler.vcsu.edu:7000/17464/ (2013-06-13)

Open archived version from archive