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InterviewSolution
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Are NULL values in a database the same as that of blank space or zero? |
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Answer» No, a NULL value is very different from that of ZERO and blank space as it represents a value that is ASSIGNED, unknown, unavailable, or not applicable as COMPARED to blank space which represents a character and zero represents a number. Example: NULL value in “number_of_courses” taken by a student represents that its value is unknown WHEREAS 0 in it MEANS that the student hasn’t taken any courses. |
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