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Showing posts with label DBMS / PL / SQL. Show all posts

Saturday, September 19, 2020

Database Systems MCQ

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Q.1 When R∩S = Ф , then the cost of computing R|><|S is (A) the same as R × S (B) greater the R × S (C) less than R × S (D) c...

Wednesday, April 28, 2010

Database System-V

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1. What is View? A simple view can be thought of as a subset of a table. It can be used for retrieving data, as well as updating or deleting...

Monday, April 19, 2010

Database System-IV

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1. What is RDBMS? Relational Data Base Management Systems (RDBMS) are database management systems that maintain data records and indices in ...

Thursday, January 14, 2010

Database System-III

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1. What is a "primary key"? Ans : A PRIMARY INDEX or PRIMARY KEY is something which comes mainly from database theory. From its be...

Database System-II

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1 . What is the difference between a "where" clause and a "having" clause? Ans : "Where" is a kind of restiric...

Sunday, November 29, 2009

Database System-I

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1.What is foreign Key? What is its purpose? A non key attribute, whose value are derived from the primary key of some other table, is known...

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