What is the difference between a Select statement that used Count (*) and a select statement that

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What is the difference between a Select statement that used Count (*) and a select statement that uses count (Column name)? How does Count (Column name) differ from Count (Distnct column name)?
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Data Modeling and Database Design

ISBN: 978-1285085258

2nd edition

Authors: Narayan S. Umanath, Richard W. Scammel

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