In a row of a relational table, an attribute can have more than one valueIn a row of a relational table, an attribute can have exactly one value or a NULL valueAn attribute of an entity can be compositeAn attribute of an entity can have more than one value
Question
In a row of a relational table, an attribute can have more than one valueIn a row of a relational table, an attribute can have exactly one value or a NULL valueAn attribute of an entity can be compositeAn attribute of an entity can have more than one value
Solution
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In a row of a relational table, an attribute can have more than one value: This statement is false. In a relational database, an attribute in a row (or record) can only have a single value. This is known as atomicity and is one of the key principles of relational databases.
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In a row of a relational table, an attribute can have exactly one value or a NULL value: This statement is true. As mentioned above, an attribute in a row can only have a single value. However, that value can be NULL, which in database terms means 'unknown' or 'not applicable'.
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An attribute of an entity can be composite: This statement is true. A composite attribute is one that can be divided into smaller parts, each of
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