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Given the basic ER and relational models, which of the following is INCORRECT?

  1. An attribute of an entity can have more than one value
  2. An attribute of an entity can be composite
  3. In a row of a relational table, an attribute can have more than one value
  4. In a row of a relational table, an attribute can have exactly one value or a NULL value
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  1. implies multivalued attribute
  2. implies composite attribute
  3. A tuple shud be unique and an attribute can’t have multiple values.===>wrong one
  4. This is correct.
Answer:

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