11 lines
339 B
Markdown
11 lines
339 B
Markdown
## Practical SQL
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[PracticalSQL](https://www.nostarch.com/practicalSQL) by Anthony DeBarros is [available from No Starch Press](https://www.nostarch.com/practicalSQL).
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### Chapter 9: Extracting Information by Grouping and Summarizing
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Explains how to use aggregate functions to find trends in U.S. library use based on annual surveys.
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