Free Cooking with MySQL Tutorial

by Paul DuBoisEditor’s note: Paul DuBois has selected sample recipes from the hundreds you’ll find in his book, MySQL Cookbook. In this first in a three-part series showcasing these sample recipes, find out how to interpret results from summaries and NULL values (excerpted from Chapter 7, “Generating Summaries”) and how to identify duplicates in a table or record (excerpted from Chapter 14, “Handling Duplicates”). Summaries and NULL ValuesProblemYou’re summarizing a set of values that 
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