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A file of employee have 10,000 blocks on a cylinder of a disk with characteristics r=8ms and btt=0.6ms I want to know the cost of read inthe file under following conditions for a q
My cut off date is very soon in a Database subject and i dont know how to solve anything in it
Explain the use of constraints in functional model with suitable example. A constraint shows relationship between two objects at same time, or among various values of the sam
what is physical data structure
Describe Participation Constraints? Participation Constraints - The participation constraint exacts whether the existence of an entity depends on its being related to another
what is bogus empowerment. And what is genuine empowerment
How many types of users works on database? Users are differentiated through the way they expect to interact along with the system (i) Application programmers-interact with
What sorts of tables one can se in designing the hierarchy of a LDB? Tables, which are having Foreign Key relations.
The result of the UNION operation between R1 and R2 is a relation that includes? The result of the operation between R1 and R2 includes all the tuples of R1 and R2 which have c
Example - ALTER TABLE emp MODIFY (empno NUMBER (7));
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