How to tell if a query will scale well?

Question

What are some of the methods/techniques experienced SQL developers use to determine if a particular SQL query will scale well as load increases, rows in associated tables increa

Answer 1

I strongly recommend reading some reference material on this. This (hyperlink below) is probably a pretty good book to look into. Make sure to look under "Selectivity", among other topics.

SQL Tuning - Dan Tow