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Define instance and schema?
Instance: Collection of data kept in the data base at a particular moment is known as an Instance of the database.
Schema: The overall design of the data base is known as the data base schema.
A software contract and consultancy firm maintains details of all the various projects in which its employees are currently involved. These details comprise: Employee Numbe
Why a report generator is used ? Report generator is used for print files on paper.
The definition of the classes and operation can often be adjusted to increase the amount of inheritance". Justify the above statement. Adjustment of Inheritance The def
These are interactive interfaces, graphical that hide the difficulty of the DBMS and query language behind an intuitive, simple to understand, and convenient interface. This permit
what is primary key
a) Suppose we updated the catalog tables in real time, that is, after every update, insert, or delete SQL statement were executed-rather than only running RUNSTATS once every few
Can a domain, assigned to a data element be changed? Yes. We can do so by just overwriting the entry in the field domain.
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:
define attribute inheritance with example?
State the definition of association An association is a structural relationship which specifies that objects of one thing are connected with objects of another. In UML, asso
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