query: SELECT document_id FROM Documents_with_expenses WHERE budget_type_code  =  'SF'
question: What-all are the document ids for the budget types codes '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-all are the document ids for the budget types codes 'SF'?