The video tutorial explains how to use the BY statement in SAS to sort variables and utilize indexes. It covers the rules for using the BY statement effectively, demonstrates importing a dataset and creating an index, and shows how to verify if the index is utilized. The tutorial also discusses scenarios where SAS may not use the index, such as when sorting by descending order or by other variables.

What are the specific rules to follow when using the buy statement in SAS?

How can you check if SAS utilized the index you created?

What happens if you attempt to sort by descending order using the buy statement?

Explain the importance of the primary variable when using the buy statement with multiple variables.

What should you keep in mind regarding the options with by processing if you want SAS to use your index?