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In E-R diagram how generalization is represented?
in E-R diagram generalization is represented by Triangle shape.
What are the typical phases of query processing
properties of derirable decomposition
Type of views : Simple views and Difficult Views Feature Simple Views Complex Views Number of tables One
What is meant by heuristic optimisation?Discuss the major heuristics that are applied during query optimisation.
Before defines the second type of integrity constraint, viz., Entity Integrity, we should be well-known with the concept of NULL. Mostly, NULL is intended as a basis for dealing
What is a database graph? The partial ordering implies that the set D may now be viewed as a directed acyclic graph, known as a database graph.
What is D command work in the respect of QBE? D: It is the command inside QBE to delete tuple(s) from the relation.
Compare the Nested-loop join and block-nested loop join Ans: Nested loop join - It is costly as worst case cost, no. of block accesses needed is n r * b s + b r where b
Describe the difference between a one-to-many and a many-to-many relationship. Which logical data structures comprise one-to-many and which comprise many-to-many relationship?
State the Object Design for Processing The object design phase comes after analysis and system design phase. The object design phase includes implementation details like as i
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