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What is a PROJECT operation?
The project operation is a unary operation that returns its argument relation with particular attributes left out. Projection is shown by pie (π).
Views A view is like a window by which data from tables can be changed or viewed. The table on which a view is based is known as Base table. The view is stored as a SELECT stat
What is Explicit update In explicit update, each derived attribute is defined with respect to one, or more fundamental base object(s). The object designer determines that de
While sorting field groups we cannot use more than one key field False.
Discuss the types of integrity constraints in which must be checked for the update operations - Insert and Delete. Give examples. Insert operation can violet any of the subse
What subschema expresses ? A subschema expresses the external view. (External schemas are called also called as subschemas)
Define a job scheduling strategy that will meet business requirement of reporting availability by 6am CST for the following cubes? Show the job scheduling dependencies in a pictori
what is the need of a log in dbms
Your friend owns a computer store in Yuen Long, selling Desktop and Notebook PCs and other computer peripherals. Having been rather successful with his business there, he decided t
what is difference between circular inked lust and grunded linked list
Explain four causes for failures in data warehouse projects
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