How_to_retrieve_data_from_two_or_more_tables/exer_5C43.sql

USE AP;

SELECT COUNT(DISTINCT vendor_id) AS number_of_vendors,
COUNT(vendor_id) AS number_of_invoices,
ROUND(AVG(invoice_total), 2) AS avg_invoice_amt,
SUM(invoice_total) AS total_invoice_amt
FROM invoices
WHERE invoice_date > '2018-01-01';