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Determine the Derived attribute to avoid re-computation
Each class box consists of an ordered list of attributes and operations, each represented as a next string. We can find location of any attribute by adding the size of all elements in front of it, to the location of the class box itself. If a new attribute string is added to a list, then locations of one's after it in the list are simply offset by size of the new element. If an element is deleted or moved, the elements under it must be redrawn.
Explain the Weak Entity Set An Entity set which does not have sufficient attribute to make a primay key is known as weak entity set. For instance, dependents of an employee in
Question: This Question refers to the database schema given in the Appendix. (a) The integrity of a database is enforced by integrity rules. Discuss what should happen on a
Homework chapter 10 no 3
Structure Of Distributed Database: A distributed database system haves of a collection of sites, each of which keeps a local databases system. Every site is able to process local
What is an Operand? The data on which the operation is to be performed is known as an Operand
The primary key is selected from the
what is Mapping Constraints? with examples
Write a short note on QBE? Stands for "Query By Example." QBE is a feature involved along with various database applications which gives user-friendly techniques of running da
What is data independence? Data Independence: Techniques which permit data to be changed without affecting the applications in which procedure it. There are two types of data
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
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