From c3dc8998479993d50e5db088d4e704cfd2dd74b6 Mon Sep 17 00:00:00 2001
From: Sorrel Harriet <sharr003@igor.gold.ac.uk>
Date: Sat, 15 Oct 2016 21:04:49 +0100
Subject: [PATCH] updating practice_queries

---
 lab-3/music-store-app/sql/practice_queries.sql | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/lab-3/music-store-app/sql/practice_queries.sql b/lab-3/music-store-app/sql/practice_queries.sql
index ba75d15..5df13d3 100644
--- a/lab-3/music-store-app/sql/practice_queries.sql
+++ b/lab-3/music-store-app/sql/practice_queries.sql
@@ -67,3 +67,17 @@ VALUES
 
 /* 4. Delete a track */
 DELETE FROM Track WHERE album_upc='726517237627'; /* EXAMPLE */
+
+/* ------------------------------------ */
+
+/* 5. Retrieve details about an order
+Include the customer_id, delivery method
+and total order value in the result-set */
+
+SELECT Transaction.customer_id, Transaction.delivery, SUM(Album.price*LineItem.quantity) AS order_total /* notice use of aggregate function! */
+FROM Transaction 
+INNER JOIN LineItem 
+	ON Transaction.id=LineItem.trans_id 
+INNER JOIN Album 
+	ON Album.upc=LineItem.album_upc
+WHERE Transaction.id=1; /* EXAMPLE */
-- 
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