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A super key is an attribute or set of attributes used to recognize the records uniquely in a relation.
For instance, in the Relation PERSON defines earlier PERSON_ID is a super key since PERSON_ID is unique for every person. Likewise (PERSON_ID, AGE) and (PERSON_ID, NAME) are also super keys of the relation PERSON as their combination is also unique for each record.
Let us now talk about the relational operations: SELECT The select operation is used to select few specific record from the database based on different criteria, This is a un
In an E-R diagram how attributes are represented ? In an E-R diagram attributes are represented in a ellipse.
What is transaction? Collections of operations that form a single logical unit of work are known as transactions.
What are the responsibility of File manager? File Manager : Manager allocation of space on disk storage and the data structures used to represent within stored on disk. It is a
Explain the Attribute inheritance Ans: Throughout the rendering of the objects in a view, attribute sets of objects higher in the view hierarchy are inherited via objects below
what factors might influence a company to outsource its IT infrascture.
how to connect vb.net with access
draw er diagram using entities crop,employee,department,plot,cultivation plan,machinery,seed,fertilizer
Homework chapter 10 no 3
What is vertical fragmentation? Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
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