query: SELECT * FROM employees WHERE hire_date  >  '1987-09-07'
question: display them employees which join after 7th September, 1987.
query_toks: SELECT * FROM employees WHERE hire_date > '1987-09-07 '
query_toks_no_value: select * from employees where hire_date > value
question_toks: display them employees which join after 7th September, 1987.