Database - Data Modeling

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

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Option : A
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42. A primary key is combined with a foreign key creates

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Option : A
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43. In E-R Diagram derived attribute are represented by

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Option : B
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44. Cross Product is a:

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Option : C
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45. An instance of relational schema R (A, B, C) has distinct values of A including NULL values. Which one of the following is true?

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Option : B
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