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One-to-many : An entity in A is related with any number of entities in B. An entity in B is related with at the most one entity in A. Example: Relationship between faculty and d
Example - ALTER TABLE emp MODIFY (empno NUMBER (7));
Illustrate the statement 'Projection operation distributes over the union operation'. Give an example. Ans: Π L (E 1 ∪ E 2 ) = (Π L (E 1 )) ∪ (Π L (E 2 )) This says th
Define DBMS? DBMS: database management system (DBMS) is computer software designed for the reason of supervision databases based on a variety of data models.
When It is better to use files than a DBMS? It is better to use files than a DBMS when Multiple users wish to access the data.
what do you mean by primary key constraint?
Why older data models are being replaced by new data modelling 100 words accepted#
Performance of Various Concurrency Control Mechanisms
Differance between Unordered and ordered file ? Unordered file do no has any sequence although ordered file has arranged in a few sequence and data are assigned in ordered form
What is candidate key? Candidate Key - A candidate key of an entity set is a minimal superkey, which uniquely identifies each row in the relation.
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