query: SELECT country FROM customers WHERE first_name = "Roberto" AND last_name = "Almeida";
question: What-all country does Roberto Almeida live?
query_toks: SELECT country FROM customers WHERE first_name = `` Roberto '' AND last_name = `` Almeida '' ;
query_toks_no_value: select country from customers where first_name = value and last_name = value
question_toks: What-all country does Roberto Almeida live?