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What are the three classes of SQL expression?
SQL expression consists of three clauses:
Select
From
Where
For the relations R and S given below: R S A B C 1 4 7 2 5 8 3 6 9
Explain the Query Processing Data Query Processing permits a user to report or analyze structured and unstructured data pulled from multiple data sources.
it can be possible to create any table without primary key
For every multivalued attribute 'A', we make a new relation R that contains an attribute corresponding to plus the primary key attribute k of the relation that shows the entity typ
Explain controlled redundancy? Controlled redundancy : The replication of data within the data warehouse for the purposes of improved data access or understand ability.
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.
lock and types of lock
What is meant by heuristic optimisation?Discuss the major heuristics that are applied during query optimisation.
Determine the Disadvantages of file based systems Some of the disadvantages of file based systems are like this: Data redundancy and inconsistency: the dissimilar applic
A database administrator''s responsibilities and data contents
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