Question: Context: Databases r on pan be represented in k! x n! ways. ** Let R = {A1,..., Ak} be a relation schema, and r be

Context: Databases r on pan be represented in k! x n! ways. Context: Databases

r on pan be represented in k! x n! ways. ** Let R = {A1,..., Ak} be a relation schema, and r be an instance of R. Which of the following statements is NOT correct? Suppose {A1} is a key of R. If r has n tuples, then the number of different values of Aj in r could be less than n. If {Aj} is a key of R, then R has 2k-1 superkeys. In relational model, every relation has at least one key. met mod

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