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What is System R? What are its two major subsystems?
System R was intended and developed over a period of 1974-79 at IBM San Jose Research Center. It is a prototype and its purpose was to illustrate that it is possible to build a Relational System that can be used in a real life environment to solve real life problems, with performance at least comparable to that of existing system.
Its two subsystems are
Research Storage
System Relational Data System.
System Design: An Object Oriented Approach Any software systems always try to change and evolve as technology and business rules evolve. The development of information systems
What are temporary tables? Temporary tables exist solely for a particular session or whose data persists for the duration of the transaction.
What is Information System?
In an E-R diagram an entity set is represent by? In an E-R digram entity set is represted by rectangle.
how many types of data model in DBMS? explain data abstraction with its different level
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