I answered how to join the tables on the columns, they asked the question again, in the exact wording. Then I answered how to add foreign key as part of table definition, they asked the question again, in the exact same wording. Then I answered "No, the string "foreign key" should not be used in part of the select statement", they asked the question again, in the exact wording. At last, I asked, "Can you please rephrase the question or give me an example? " --"No!"