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Question: (a) Discuss the difference between a composite key and a composite attribute. How would each be indicated in an E-R diagram? Support your answer with appropriate exam
To delete a particular column in a relation which command is used ? To delete a particular column in a relation ALTER command is used.
Database Recovery And Security Introduction In this part we will introduce two main issues relating to database management systems. A computer system suffers from dissi
Which is another name for weak entity? Child is another name of weak entity.
What is vertical fragmentation? Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
Explain the Check Clause The CHECK clause is employed to at the end of a CREATE TABLE statement specify table constraints. This is known as table-based constraint because it ap
How to create values of structured type? Constructor functions are used to make values of structured types. A function with the similar name as a structured type is a construct
Discuss how the one-to-one associations have to be implemented. Some of properties of associations can be implemented directly by providing suitable declarations of the data me
distributed quey processing
why older data models are being replaced by new data models.
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