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What is Outer join? They can be employed while we want to keep all the tuples in R, or all those in S or all those in both relations in the result of the JOIN in spite of of w
Define physical image of a global relation at a site
coventions for displaying an ER schema as ER diagram
Question (a) Concurrent access to data from a database is a normal part of application program usage. Describe three approaches to concurrency control (b) Distinguish among
Need a sample of a clinic database relationships
Support by Adding Indexes Multiple indexes can be used to access a data file by multiple access paths. In such a scheme only single copy of the data is consider, only the numbe
State the definition of association An association is a structural relationship which specifies that objects of one thing are connected with objects of another. In UML, asso
Answer SQL Queries to extract data from data tables and questions on mapping conceptual data models into relational data model.
Advantages And Drawbacks Of Ddbms There are various reasons for building distributed database systems, with sharing of data, reliability and availability, and speedup of query
In E-R Diagram how derived attribute are represented ? In E-R Diagram By Dashed ellipse derived attribute are represented.
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