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Explain the steps for reduction of E-R model into relational model.
Ans:(a) Entity set in E-R model will be considered as table name in relational Model.
(b) Attributes of entity set in E-R diagram will be referred as fields or column name of table.
(c) Underline attributes of Attribute in E-R model will be considered as Primary key of the table.
What are the several forms of identity? a) Value b) Name c) Built-in
What is a checkpoint? List the operations to be performed by the system when a checkpoint is to be taken. What does the recovery system do if there is a crash? There is large n
Improved performance: As the data is located near the site of its demand, and given the inherent parallelism because of multiple copies, speed of database access may be good for di
What is the main difference between read-only and update methods? A read-only method does not affect the values of a variable in an object, whereas an update method may alter t
Critically evaluate the bulleted list of information-related items in this case study. How are each contradictory to the notion of being an information-literate knowledge worker?
The natural join is equal to which product? The natural join is equal to Combination of projection and Cartesian product
It can be easily defined as: The database must not have any unmatched foreign key values. The term "unmatched foreign key value" means a foreign key value for which there doe
Advantages of Database management system Let us summarize the advantages. Reduction of Redundancy: This is perhaps the most important advantage of using DBMS. Redundancy i
Discuss the differences among the candidate keys and the primary key of a relation. Give instance to describe your answer? A candidate key is one that can be used as primary ke
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