What is the invoice number and invoice date corresponding to the invoice with the greatest number of transactions?
return invoices ;return transactions of #1 ;return number of  #2 for each #1 ;return #1 where #3 is highest ;return invoice number of #4 ;return invoice date of #4 ;return #5 ,  #6
['select', 'project', 'group', 'superlative', 'aggregate', 'project', 'union']