Write a select statement that answers this question: which invoices have a paymenttotal that's greater than the median paymenttotal for all paid invoices? (the median marks the midpoint in a set of values; an equal number of values lie above and below it.) return the invoicenumber and invoicetotal for each invoice. hint: begin with the solution to exercise 2, then use the all keyword in the where clause and code "top 50 percent paymenttotal" in the subquery.