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Bitmap indices are a specialized type of index designed for easy querying on ___________

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Bitmap indices are a specialized type of index designed for easy querying on ___________ (a) Bit values (b) Binary digits (c) Multiple keys (d) Single keys I had been asked this question during an interview for a job. My question is based upon Bitmap Indices in division Indexing and Hashing of Database Management

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The correct option is (c) Multiple keys The best I can explain: Each bitmap index is built on a single key.

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