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Explain about primary key Primary Key: It is one of the candidate keys that are taken to be the recognizing key for the entire table. E.g. although there are two candidate ke
QUESTION (a) Consider a car database consisting of car model, car make, car origin, Engine capacity, color, cost.
Define Physical and Logical independence Ans: Physical data independence: The ability to modify physical level without causing application program to be rewritten. Logic
In E-R diagram how generalization is represented? in E-R diagram generalization is represented by Triangle shape.
Hi is anyone well versed in accounting information systems available now to help me work through an important assignment due tomorrow at noon?
A database administrator''s responsibilities and data contents
Explain the Cascadeless Schedule A cascadeless schedule is one in which for every pair of transactions Ti and Tj like that Tj reads a data item before written by Ti, the commit
Explain how the associations are implemented as classes. A general approach in this case is to transform an association class into a simple class linked to two original classes
While using extract datasets it is required to have a special workarea for interface False. It is not required to have a special workarea for interface
Mappings between Levels and Data Independence The 3 levels of abstraction in the database do not exist separately of each other. There must be some correspondence, or mapping
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