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Differance between internal and external schema?
Internal and external schema: Internal Schema• Describes the physical storage structure• Uses a physical data model External Schema• Includes a number user views• Uses a conceptual or an implementation data model
Implementation and SQL Applications
Normal 0 false false false EN-US X-NONE X-NONE
For the relations R and S given below: R S A B C 1 4 7 2 5 8 3 6 9
What is meant by the degree of relationship set? The degree of relationship type is the number of participating entity types.
Locks: Serialisabilty is just a test whether a given interleaved schedule is ok or has a concurrency related trouble. Though, it does not make sure that the interleaved concurrent
Surgeons identified by doctor ID (DOCID) operate on patients identified by patient ID (PATID) in operating theaters identified by room numbers (ROOMNO). Each surgeon can operate on
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
For each m:n relationship type R, we make a new table (say S) to represent R. We also contain the primary key attributes of both the participating entity types as a foreign key att
Define blocks? The database system resides eternally on non-volatile storage, and is into fixed-length storage units known as blocks.
WHY SHOULD NULL IN A RELATION BE AVOID AS possible?
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