query: SELECT count(DISTINCT city) FROM stadium WHERE opening_year  <  2006
question: How many cities having stadium that have been opened it year 2006?
query_toks: SELECT count ( DISTINCT city ) FROM stadium WHERE opening_year < 2006
query_toks_no_value: select count ( distinct city ) from stadium where opening_year < value
question_toks: How many cities having stadium that have been opened it year 2006?