Table schema:
CREATE TABLE Invoices (invoice_number VARCHAR, invoice_date VARCHAR); CREATE TABLE Financial_transactions (invoice_number VARCHAR)

Question: What is the invoice number and invoice date for the invoice with most number of transactions?
SQL: 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