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Explain Data Sublangauges ?
Data sublanguage: In relational database theory, the term sublanguage, first used for this purpose through E. F. Codd in the year of 1970, refers to a computer language used to describe or manipulate the structure and contents of a relational database management system (RDBMS). Typical sublanguages related along with modern RDBMS's are QBE (Query by Example) and SQL (Structured Query Language).
Explain view in RDBMS? View - A view is a relation (virtual rather than base) and could be used in query expressions, which is, queries can be written by using the view as a re
explain in details about one to one binary relationship
A B-tree of order how much children m has maximum ? m has maximum m mchildren in a B tree.
Why a report generator is used ? Report generator is used for print files on paper.
WOUND-WAIT
Q. Explain the terms key constraints participation constraints and mapping caradinalities in ER model. Participation Constraints : The participation of an entity set E i
If the deletion violates referential integrity constraint, then three alternatives are available: Default option: - refuse the deletion. It is the job of the DBMS to describ
Which language has presently become the defacto standard for interfacing application programs along with relational database system? The language which has recently become the
Importance Of File Organisation In Database To execute a database efficiently, there are various design tradeoffs needed. One of the most vital ones is the file Organisation. F
Which is a legal expression in SQL? SELECT NAME FROM EMPLOYEE is a legal expression in SQL.
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