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APPLY LATEST GOVT JOBS

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96 Which of the following is record based logical model?
(A). Network Model
(B). Object oriented model
(C). E-R Model
(D). None of these


97 A data dictionary is a special file that contains:
(A). The name of all fields in all files.
(B). The width of all fields in all files.
(C). The data type of all fields in all files.
(D). All of the above.


98 A file manipulation command that extracts some of the records from a file is called
(A). SELECT
(B). PROJECT
(C). JOIN
(D). PRODUCT


99 The physical location of a record is determined by a mathematical formula that transforms a file key into a record location is :
(A). B-Tree File
(B). Hashed File
(C). Indexed File
(D). Sequential file.


100 Using Relational Algebra the query that finds customers, who have a balance of over 1000 is
(A). Π Customer_name(σ balance >1000(Deposit))
(B). σ Customer_name(Π balance >1000(Deposit))
(C). Π Customer_name(σ balance >1000(Borrow))
(D). σ Customer_name(Π balance >1000(Borrow))