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Write short notes on relational model
The relational model uses a collection of tables to show both data and the relationships between those data. The relational model is an example of a record based model.
Information about films holds information about movies, stars and studios. Movies have a title, year of production, length and the film type. Stars have a name and address. Studi
Mention the several levels in security measures. A) Database system B) Operating system C) Network D) Physical Human
WRITE SHORT NOTES ON INDEX STRUCTURE OF FILES? There are two basic parts of indices 1. Ordered indices 2. Hash indices Every technique must be evaluated on the bas
What is Relational Algebra? Relational algebra is a Procedural query Language?
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What are called index-sequential files? The files that are ordered sequentially with a primary index on the search key are known as index-sequential files
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.
One-to-many : An entity in A is related with any number of entities in B. An entity in B is related with at the most one entity in A. Example: Relationship between faculty and d
what is physical data structure
Explain briefly concurrent task by taking an example. Concurrent Task- The concurrent occurrence of more than one event is called concurrent task. Operating systems can handl
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