remaining 6 exercices done in class

exercise_1.sql

@@ -2,4 +2,47 @@ SELECT vendor_id, SUM(invoice_total)
 FROM invoices
 GROUP BY vendor_id;
 
+SELECT v.vendor_name, SUM(i.payment_total) AS payment_total_sum
+FROM vendors v
+JOIN invoices i
+ON v.vendor_id = i.vendor_id
+GROUP BY vendor_name
+ORDER BY payment_total_sum DESC;
+
+SELECT vendor_name,
+Count(*) AS invoice_count, SUM(invoice_total) AS invoice_total_sum
+FROM vendors v
+JOIN invoices i
+ON v.vendor_id = i.vendor_id
+GROUP BY vendor_name
+ORDER BY invoice_count;
+
+SELECT account_description, Count(*) AS line_item_count, Sum(line_item_amount) AS line_item_amount_sum
+FROM General_Ledger_Accounts g
+JOIN Invoice_Line_items li
+on g.account_number= li.account_number
+JOIN invoices i
+ON i.invoice_id = li.invoice_id
+WHERE invoice_date BETWEEN '2018-04-01' AND '2018-06-30'
+GROUP BY account_description
+HAVING line_item_count > 1
+ORDER BY line_item_amount_sum DESC;
+
+SELECT account_number, SUM(line_item_amount) AS line_item_amount_sum
+FROM Invoice_Line_items
+GROUP BY account_number WITH ROLLUP;
+
+SELECT vendor_name, COUNT( DISTINCT account_number) AS number_of_accounts
+FROM vendors v
+JOIN invoices i
+ON v.vendor_id = i.vendor_id
+JOIN Invoice_Line_Items li
+ON i.invoice_id = li.invoice_id
+
+GROUP BY vendor_name
+HAVING number_of_accounts > 1;
+
+
+
+