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In case of entity integrity, the primary key may be declared?
In a case of entity integrity primary key may be not Null.
why three level architecture had been developed/
What does Aggregation mean?
What are the advantages of having an index structure? Ans: The index structures commonly provide secondary access paths, which offer alternative ways of accessing the reco
er diagram on cosmetics.
Explain Domain calculus Domain calculus is one of the types of the relational calculus. The formal specification of the domain calculus was planned after the development of the
Which model is record based logical model? Network Modelis basically known as record based logical model.
word limit no mentioned
what problems are raised by the database? why is it so controversial? why is data quality an issue?
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Which sorting technique is used to sort databases, whose sizes are very big? Give one such algorithm. Why do sorting techniques like quicksort, insertion sort, etc. not applied
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