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Explain I command in QBE ?
I : It is the command in QBE that is used to insert tuple (s) into the database
what is Mapping Constraints? with examples
Conflicting Operations in Schedule: The three simple ways of interleaved instruction implement of transactions T1 and T2. Please note that in the following tables the first col
Define query optimization. Query optimization refers to the process of search the lowest -cost method of evaluating a given query.
Update or Modify operation alters the existing values. If these operations alter the value that is the foreign key also, the only check need is the similar as that of the Insert op
Data independence seems that "the application is independent of the access strategy and storage structure of data". In other words, the ability to change the schema definition in o
Question 1 Explain ER model Question 2 What are the characteristics of a computer provided information? Question 3 What are facts and guidelines to be considered when se
Define access time. Access time is the time from when a read or write request is issued to when data transfer starts.
A buyer for a large department store chain must place orders with an athletic shoe manufacturer six months prior to the time the shoes will be sold in the department stores. In par
What is object containment? References among objects can be used to model dissimilar real-world concepts.
Object-oriented decompositions Object-oriented decompositions of systems better are able to cope with change. Each subsystem has a well-defined interface which communicates with
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