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What is a SELECT operation? The select operation selects tuples that please a given predicate. We use the lowercase letter σ to denote selection.
what do you understand by enhanced entity-relationship
what is definition hierarchical data model
what characterizes the levels in RAID technology
Ask question #Minim 100 words accepted#what is recovery management component in database management system and how it is useful
Question 1 Explain the concept of Foreign Key. How a foreign key differs from a Primary Key? Can the Foreign Key accept nulls? Question 2 With a necessary example explain (i)
What are object interaction diagrams? Object interaction diagrams are the diagrams that used to describe order in which messages are communicated in execution of an operation,
In an E-R diagram how attributes are represented ? In an E-R diagram attributes are represented in a ellipse.
What is view in SQL? How is it defined? Any relation that is not part of the logical model, but is made visible to a user as a virtual relation is known as a view. We descri
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