query: SELECT last_name FROM staff WHERE email_address LIKE "%wrau%"
question: What-all are the last names of staffs with emails addressed a-containing the substring "wrau"?
query_toks: SELECT last_name FROM staff WHERE email_address LIKE `` % wrau % ''
query_toks_no_value: select last_name from staff where email_address like value
question_toks: What-all are the last names of staffs with emails addressed a-containing the substring "wrau"?