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Discuss along with examples about several types of attributes present in the ER model?
Types of Attributes are:• SIMPLE attributes are attributes which are drawn from the atomic value domains E.g. Name = {John} ; Age = {23}• COMPOSITE attributes: Attributes that consist of a hierarchy of attributes E.g. Address may consists of "Number", "Street" and "Suburb" → Address = {59 + ‘Meek Street' + ‘Kingsford'}• SINGLE VALUED attributes: Attributes which have only one value for each entity E.g. Name, Age for EMPLOYEE• MULTIVALUED attributes: Attributes that have a set of values for each entity E.g. Degrees of a person: ‘ BSc' , ‘MIT', ‘PhD'• DERIVED attributes: Attributes Contain values which are computed from other attributes Eg. Age can be derived from attribute DateOfBirth. In this situation, DateOfBirth might be known as Stored Attribute
How persistent programming languages differ from traditional programming languages? Database languages vary from traditional programming languages in that they directly manipul
Which is the properties of entities? Attributes is the properties of entities.
What is catalog in DBMS? Catalog - A relational DBMS maintains information about every table and index in which it contains. A catalog is a collection of special tables that st
Consider a bank that has a collection of sites, each running a database system. Suppose the only way the databases interact is by electronic transfer of money between one another,
What does the cardinality ratio specify? Mapping cardinalities or cardinality ratios state the number of entities to which another entity can be associated. Mapping cardinaliti
Consider entity type Employee with attributes empNumber (this is unique), empName, and the year when he/she was hired. An employee can either be a technical employee, a marketing e
Why did SAP introduce the extended star schema? Explain why it is reported to be better than the traditional schema model?
Explain the Dynamic Hashing Techniques There are two methods in it: extendible hashing - stores an access structure in addition to the file, and therefore is somewhat identica
Replication : It is definite as a copy of a relation. Every replica is stored at a dissimilar site. The alternative to replication is to store only single copy of a relation which
example of bank
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