query: SELECT document_id FROM Documents_with_expenses WHERE budget_type_code  =  'SF'
question: What document id budget type code 'SF'?
query_toks: SELECT document_id FROM Documents_with_expenses WHERE budget_type_code = 'SF '
query_toks_no_value: select document_id from documents_with_expenses where budget_type_code = value
question_toks: What document id budget type code 'SF'?