Practical SQL
PracticalSQL by Anthony DeBarros is available from No Starch Press.
Chapter 9: Extracting Information by Grouping and Summarizing
Explains how to use aggregate functions to find trends in U.S. library use based on annual surveys.
PracticalSQL by Anthony DeBarros is available from No Starch Press.
Explains how to use aggregate functions to find trends in U.S. library use based on annual surveys.