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What are the technique to define a schema completely ? A schema is completely define by DDL and DML query language.
Cardinality of Relationship One-to-One Only one entity of the first set is linked to only one entity of the second set. E.g. A teacher teaches a student. Only one teacher
What is RDBMS terminology for a row? A tuple is a RDBMS terminology for a row
What are the disadvantages of relational approach? Disadvantages of relational approach: • Substantial hardware and system software overhead • May not fit all business models •
List the Armstrong's axioms for functional dependencies. What do you understand by soundness and completeness of these axioms? Ans: The Armstrong's axioms are: F1:
Example - ALTER TABLE emp MODIFY (empno NUMBER (7));
Explain hash file organization? Hash functions a) The distribution is uniform Hash functions assign each bucket the similar number of search -key values from the set of a
Describe relational model? Structure of relational data base Basic structure Database schema Keys Schema diagram Query languages
What is a guard condition? Explain it with a suitable example. The guard-condition is a Boolean expression written with respect to parameters of triggering event and attributes
Need 2 projects completed in 3NF format.
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