From 5d45633ab54d04c638afae3223fc81f8a0ab1701 Mon Sep 17 00:00:00 2001
From: Eugene Tan <eugenetan@Eugenes-MacBook-Air.local>
Date: Mon, 13 Dec 2021 01:39:58 +0800
Subject: [PATCH] Did HW 5

---
 .gitignore                    |   1 +
 __pycache__/db.cpython-38.pyc | Bin 0 -> 388 bytes
 app.py                        |  58 +++++++++++++++++++++++++++++++++-
 3 files changed, 58 insertions(+), 1 deletion(-)
 create mode 100644 .gitignore
 create mode 100644 __pycache__/db.cpython-38.pyc

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ce514ff
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+db.py
\ No newline at end of file
diff --git a/__pycache__/db.cpython-38.pyc b/__pycache__/db.cpython-38.pyc
new file mode 100644
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diff --git a/app.py b/app.py
index e293225..99e7c86 100644
--- a/app.py
+++ b/app.py
@@ -1 +1,57 @@
-# Your DB Code Here
+import pymongo
+import datetime
+from db import * 
+
+db = rhdevsdb
+
+# 1.Number of entries of selling data grouped by isbn
+y = db.books_selling_data.aggregate(
+    [{"$group": { "_id": "$isbn", "count" : {"$sum" : 1}}}]
+    )
+
+print(list(y))
+
+
+#2. For books with more than 15000 total copies sold, return all the titles in a single array
+y = db.books_selling_data.aggregate(
+    [{"$group": { "_id": "$isbn", "total_copies" : {"$sum" : "$copies_sold"}}},
+    {"$match": { "total_copies" : {"$gt" : 15000 }}},
+    {"$lookup": { "from" : "books", "localField": "_id", "foreignField": "isbn", "as":"filtered"}},
+    { "$project" : { "filtered.title" : 1, "_id" : 0 } }
+    ])
+
+print(list(y))
+
+# 3. Find the number of books by John Doe, sorted by isbn (but isbn is not returned)
+
+y = db.books.aggregate(
+    [{"$group": { "_id": "$isbn", "author" : { "$push" : "$author" }, "title" : { "$push" : "$title" }}},
+    {"$match" : { "author" : "John Doe"}},
+    { "$sort": { "_id": 1}},
+    { "$project" : { "title" : 1, "_id" : 0 }},
+    ])
+
+print(list(y))
+
+
+#4. Return the price per book for each order
+
+y = db.books_selling_data.aggregate(
+    [{"$addFields" : {"price_per_book ": {"$divide": ["$total_price", "$copies_sold"]}}},
+    {"$project" : { "order_id" : 1, "price_per_book" : 1 }}
+    ])
+
+print(list(y))
+
+
+#5. Return the average price per book for each order supplied from titan
+
+y = db.books_selling_data.aggregate(
+    [{"$addFields" : {"price_per_book ": {"$divide": ["$total_price", "$copies_sold"]}}},
+    { "$unwind" : "$supplier"},
+    { "$match" : { "supplier" : "titan"}},
+    {"$group":{"_id":"$supplier", "average price per book": {"$avg": "$price per book"}}}
+    ])
+
+print(list(y))
+