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Discuss the various reasons that lead to the occurrence of null values in relations?
Wiki User
∙ 12y ago
If an instance (tuple) of a relation lacks having that attribute. i.e: a student that does not have a mobile phone or an office phones. The values for these attribute for that particular student will be null. It is important to note that a null value can mean either an unknown value, or a value that exists, but not yet available.
Wiki User
∙ 12y ago
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