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What is transaction?
Transaction is a unit of program implementation that accesses and possibly updated several data items.
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
What is meant by heuristic optimisation?Discuss the major heuristics that are applied during query optimisation.
Ask question #Minim 100 words accepted#what is recovery management component in database management system and how it is useful
What is a view in SQL? When can views be updated? A view is a virtual table which consists of columns from one or more tables. Through it is same to a table; it is stored in
as a customer service employee, explain five measures you would recommend a displeased student to patronise a school canteen
i need to implememnt a treee based mining algorithm. do you have an expert that can do that?
Define Assertions in SQL a. An assertion is a predicate that is expressing a condition we wish the database to always satisfy. b. Domain constraints, functional dependency
random file orgnization
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
Multiple column Queries: Syntax: SELECT COLUMN1, COL2,...... FROM TABLE WHERE (COLUMN1, COL2, ...) IN (SELECT COLUMN1, COL2,.... FROM TABLE WHERE );
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