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Define an abstraction by which relationships are treated as higher level entities
Ans: Aggregation.
It is an abstraction by which relationships are treated as higher level entities Aggregation. (In ER diagram, aggregation is utilized to denote a relationship as an entity set.)
what do you mean by consistency in rdbms?
er diagtram for icici
Determine the language that needs a user to specify the data to be retrieved with no specifying exactly how to get it is Ans: Non-Procedural DML
Describe file organisation? A file is organized logically as a sequence of records. These records are mapped onto disk blocks. A) Fixed-Length Records Type deposit=record
Define Atom of domain relational calculus An atom has the outline 1 , x 2 , ... , x n > -> r , in which r stands for a relation on n attributes and x 1 , x 2 , ... , x n ar
CREATE TABLE prodtrans ( pno number (4) ptype char (1) CHECK (ptype in ('I','R','S')), qty number (5) FOREIGN KEY pno REFERENCES product (pno) ON DELETE CASCADE);
What is conceptual schema? The schemas at the view level are known as subschema that describe dissimilar views of the database.
Give some encryption techniques? A) DES B) AES C) Public key encryption
Describe relational model? Structure of relational data base Basic structure Database schema Keys Schema diagram Query languages
What are axioms? Axioms or rules of inference give a simpler technique for reasoning about
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