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A Functional dependency is described by X Y between two groups of attributes Y and X that are subsets of R specifies a constraint on the possible tuple that can make a relation state r of R. The constraint is for any two tuples t2 and t1 in r if t1[X] = t2[X] then they have t1[Y] = t2[Y]. This seems the value of X element of a tuple uniquely calculates the value of element Y.
Explain the Deferred Update The deferred update methods do not physically update the database on disk till after a transaction reaches its commit point; after that the updates
Explain cursors in SQL? Cursors in SQL - An object used to store the output of a query for row-through-row processing through the application programs. Cursors are constructs
What is a records management consultation? Our organization is an authority for disseminating your specific requirements and giving you with a solution to effectively manage yo
What is the difference among a database schema and a database state? The collection of information stored in database at particular moment in time is known as database state a
What does Aggregation mean?
what is the need of a log in dbms
Haw does it work one database application
Write a short note on built in function in QBE? Built in function in QBE: QBE involves various built in functions like AVG, MAX,MIN,SUM and CNT. We must prefix these operator
What is a relationship called when it is maintained between two entities? A relationship is called Binary relationship when it is maintained between two entities.
This project will involve designing and creating a database for an organization. In the design of a database, there is no single "perfect" design. So your database design may not
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