query: SELECT date_from FROM Project_Staff ORDER BY date_from ASC LIMIT 1
question: When did the first staff for the projects started working?
query_toks: SELECT date_from FROM Project_Staff ORDER BY date_from ASC LIMIT 1
query_toks_no_value: select date_from from project_staff order by date_from asc limit value
question_toks: When did the first staff for the projects started working?