Database MCQ - ER-model & Relational Model

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41:  

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 file
D.	All of the above
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	Option: D Explanation : Click on Discuss to view users comments. Write your comments here: Updating your Comments.. Updating your Comments..

42:  

 A file manipulation command that extracts some of the records from a file is called

A.	SELECT
B.	PROJECT
C.	JOIN
D.	PRODUCT
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	Option: A Explanation : Click on Discuss to view users comments. Write your comments here: Updating your Comments.. Updating your Comments..

43:  

 A primary key is combined with a foreign key creates

A.	Parent-Child relationship between the tables that connect them
B.	Many to many relationship between the tables that connect them.
C.	Network model between the tables that connect them.
D.	None of the above
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	Option: A Explanation : Click on Discuss to view users comments. Write your comments here: Updating your Comments.. Updating your Comments..

44:  

 In E-R Diagram derived attribute are represented by

A.	Ellipse
B.	Dashed ellipse
C.	Rectangle
D.	Triangle
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	Option: B Explanation : Click on Discuss to view users comments. Write your comments here: Updating your Comments.. Updating your Comments..

45:  

Cross Product is a:

A.	Unary Operator
B.	Ternary Operator
C.	Binary Operator
D.	Not an operator
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	Option: C Explanation : Click on Discuss to view users comments. Write your comments here: Updating your Comments.. Updating your Comments..

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