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multidimensional data model
What subschema expresses ? A subschema expresses the external view. (External schemas are called also called as subschemas)
Define object-relational systems? Systems that give object-oriented extensions to relational systems are known as object-relational systems.
A Structure of a dependency diagram
Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department.
gyan gurukul is a software company that provides software related solution.
Consider the following six relation schemes and their corresponding sets of functional dependencies. In each case identify a. All the candidate keys b. The highest normal for
Discuss the mechanism to read data from and write to a disk? Disk read/write heads are mechanisms in which read data from or write data to disk drives. The heads have gone by
a set of possible data value of an attribute is called??
external and internal mapping with examples
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