Join columns from multiple tables
Tested with your data on an old version (4.24) of MySql and this should be your query
SELECT r.Name, b.Title, br.RatingFROM Reviewer r JOIN BookReview br on br.ReviewerID = r.ReviewerID JOIN Book b ON b.ISBN = br.ISBNWHERE r.EmployedBy IS NULL OR r.EmployedBy = ''this is the result
'Leone', 'How to Keep your Cellular Bill Down', 7
'Leone', 'How to Keep your Cable Bill Down', 7
'Leone', 'From Deep in the Heart of Texas to IT', 6