query: SELECT date_to FROM Project_Staff ORDER BY date_to DESC LIMIT 1
question: What-all is the last date that a staff member had left a project?
query_toks: SELECT date_to FROM Project_Staff ORDER BY date_to DESC LIMIT 1
query_toks_no_value: select date_to from project_staff order by date_to desc limit value
question_toks: What-all is the last date that a staff member had left a project?