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UGC-NET | UGC NET CS 2016 July – II | Question 18
In a relational database model, NULL values can be used for all but which one of the following ?
(A)
To allow duplicate tuples in the table by filling the primary key column(s) with NULL.
(B)
To avoid confusion with actual legitimate data values like 0 (zero) for integer columns and ’’ (the empty string) for string columns.
(C)
To leave columns in a tuple marked as ’’unknown’’ when the actual value is unknown.
(D)
To fill a column in a tuple when that column does not really ”exist” for that particular tuple.
Answer
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