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What is candidate key?
Candidate Key - A candidate key of an entity set is a minimal superkey, which uniquely identifies each row in the relation.
Consider an information system designed for an online company which provides IT products and services These include desktops, laptops, networking products, IT books, parts, and
File Manager File manager handles the allocation of space on disk storage. It starts and maintains the list of structures and indices described in the internal schema that is
While sorting field groups we cannot use more than one key field False.
Lack of standards and experience: The lack of standards has considerably limited the potential of distributed DBMSs. As well, there are no tools or methodologies to help users cha
object oriented database
explain participation constraints with examples
give me a diagram about physical or internal level
Describe briefly models which define the operations on classes. The three models which are used to define operations on classes are as: Object Model = data dictionary + Obje
1. Which model is used to store data in tree structures Ans: Hierarchical model is used to store data in tree structures
State The position of object at any moment is called state. An object can have many states depend upon time. After receiving some input instructions, the object can change its
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