SELECT billing_state ,  COUNT(*) FROM invoices WHERE billing_country  =  "USA" GROUP BY billing_state;
How many invoices were billed from each state?
SELECT billing_state , COUNT ( * ) FROM invoices WHERE billing_country = `` USA '' GROUP BY billing_state ;
select billing_state , count ( * ) from invoices where billing_country = value group by billing_state
How many invoices were billed from each state ?