query: SELECT open_date FROM church GROUP BY open_date HAVING count(*)  >=  2
question: Show opening year whcih at least two church open.
query_toks: SELECT open_date FROM church GROUP BY open_date HAVING count ( * ) > = 2
query_toks_no_value: select open_date from church group by open_date having count ( * ) > = value
question_toks: Show opening year whcih at least two church open.