What is meant by the selectivity for a column in a physical table? What type of indexing technique is suitable for low-selectivity data? Why?

Use no more that 2 in-text citation / quotes.

Attached files are from the following text book:

Data Warehousing Fundamentals for IT Professionals, 2nd Edition
Paulraj Ponniah
ISBN: 978-0-470-46207-2
Wiley 2010

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