query: SELECT address FROM employees WHERE first_name = "Nancy" AND last_name = "Edwards";
question: What is Nancy Edwards's address?
query_toks: SELECT address FROM employees WHERE first_name = `` Nancy '' AND last_name = `` Edwards '' ;
query_toks_no_value: select address from employees where first_name = value and last_name = value
question_toks: What is Nancy Edwards's address?