What is the invoice number and invoice date for the invoice with most number of transactions?
create table invoices (invoice_number varchar, invoice_date varchar, PRIMARY KEY (invoice_number)); create table financial_transactions (invoice_number varchar, PRIMARY KEY (invoice_number))
select t2.invoice_number, t2.invoice_date from financial_transactions as t1 join invoices as t2 on t1.invoice_number = t2.invoice_number group by t1.invoice_number order by count(*) desc limit 1