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The strategy can retrieve a single record if the equality condition is on a key; multiple records may be retrieved if the indexing field is not a key is

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The strategy can retrieve a single record if the equality condition is on a key; multiple records may be retrieved if the indexing field is not a key is (a) A2 (b) A4 (c) A5 (d) A6 I had been asked this question in a national level competition. Question is from Selection Operation in section Query Processing Techniques of Database Management

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Correct answer is (b) A4 Explanation: A4 – Secondary index, equality.

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