Which of the following statements is not correct? a. Index creation can help improve the performance of

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Which of the following statements is not correct?

a. Index creation can help improve the performance of join queries.

b. Indexing makes it harder to enforce uniqueness on a (combination of) column(s).

c. An index implies a logical ordering of the rows in a table.

d. An index can be used to create a physical ordering of rows.

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