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Write short notes on extension and intension?
In any data model, it is significant to distinguish among the description of the database and the database itself the description of a database is known as database schema, that is specified during database design and is not expected to change often. The actual data in a database is database itself. May change quite frequently.
The schema is sometimes is known as the intension, and a database state is known as an extension of the schema.
What are the three data anomalies that are likely to occur as a result of data redundancy? Can data redundancy be completely eliminated in database approach? Why or why not? A
WOUND-WAIT
What is the difference between link and reference? The fundamental difference between links and references is that links are symmetrical on the other hand references refer only
Type of database technology
What are advantages of object models? Object models are efficient for communicating with the application experts and reaching a consensus about the significant aspects of the p
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E-R model uses this symbol to represent weak entity set ? A Doubly outlined rectangle symbol is used to represent weak entity set.
What is difference between primary index and secondary index? Primary Index a) It is an ordered file whose records are of fixed length along with two fields. b) Only base
The State of NewYork certifies firefighters throughout state and keep track all of them, as well as of the state’s fire departments. Each fire department has unique department numb
what are information system hirarchy?
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