query: SELECT invoice_number ,  count(*) FROM Financial_transactions GROUP BY invoice_number
question: How many transactions are corresponding to each invoice number?
query_toks: SELECT invoice_number , count ( * ) FROM Financial_transactions GROUP BY invoice_number
query_toks_no_value: select invoice_number , count ( * ) from financial_transactions group by invoice_number
question_toks: How many transactions are corresponding to each invoice number?