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What is the use of Union and intersection operation?
Union: The result of this operation contains all tuples that are either in r1 or in r2 or in both r1 and r2.Duplicate tuples are automatically eliminated. Intersection: The result of this relation contains all tuples that are in both r1 and r2.
What are wait-for-graphs?Give the algorithm to construct a wait-for-graph from a given schedule of transactions? How can deadlocks be detected from wait-for-graphs? Ans: The
What are the parts of SQL language? The SQL language has various parts: data - definitition language Data manipulation language View definition Transaction contr
Define physical image of a global relation at a site
Need a sample of a clinic database relationships
explain in detail about crash recovery
What is vertical fragmentation? Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
A database has been designed for this beauty parlour in order for the staff to manage specific things such as bookings made by clients, payments, staff availability, level of exper
Define Partial Key and Primary Key A partial key, also known as discriminator, is the set of attributes which can uniquely identify weak entities that are related to similar o
What is conceptual schema? The schemas at the view level are known as subschema that describe dissimilar views of the database.
What is the used of specifying alias? Specifying alias: is used to rename column or attribute in a table.
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