Informative basic instructions – SQL Pro Review

This app does have a well thought out instruction for learning the basic concepts for SQL. The only concern I have are some minor, yet confusing errors in the examples. For example, the text may refer to a column named 'customers' while the example displays 'persons'. Although a small error, this mistake could be very confusing for a beginner. I would expect better proofing prior to publishing. Besides that issue, I believe this app to be easy to comprehend introduction for someone with no SQL experience.
Review by The Bergster on SQL Pro.