finished exercise 4

exercise_4.sql

@@ -0,0 +1,17 @@
+SELECT
+	vendor_name,
+    i.invoice_id,
+    invoice_sequence,
+    line_item_amount
+FROM 
+	invoices i JOIN vendors v
+		ON v.vendor_id = i.vendor_id
+	JOIN invoice_line_items li 
+		ON i.invoice_id = li.invoice_id
+WHERE i.invoice_id IN (SELECT DISTINCT invoice_id
+					 FROM invoice_line_items
+					 WHERE invoice_sequence > 1)
+ORDER BY vendor_name, invoice_id, invoice_sequence;
+
+
+