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Define instance and schema?
Instance: Collection of data stored in the data base at a certain moment is
Schema: The overall design of the data base is known as the data base schema.
Design a gennalization and specialization hierarchy for an automobile sales company
what is 3nf
This constraint shows that the key attribute value in each tuple must be unique, i.e., no two tuples have the similar value for the key attribute. This is because the value of the
Having clause This clause is used for producing conditions on grouped information. Example: Find maximum salary and department number of those departments where maxim
how to data store?
What is storage manager? A storage manager is a program module that gives the interface between the Low level data kept in a database and the application programs
Unrepeatable reads : Assume T7 reads X twice during its implementation. If it did not update X itself it could be very disturbing to see a dissimilar value of X in its next read. B
Critically explained the benefits and limitations of different database technologies with proper examples
vertical fragmentation
Explain outer join? Outer Join - If there are any values in one table which do not have corresponding value(s) in the other, in an equi-join which will not be chosen. Such ro
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