WM5 | AISHA_ATHMAN_LALI | MODULE_DATABASES | WEEK_3 | CYF_E-COMMERCE

Big-Spender/readme.md

@@ -48,7 +48,7 @@ You are working with Claire and Farnoosh, who are trying to complete a missing r
 **You:** Absolutely. Here's the SQL query you need:
 
 ```sql
-INSERT YOUR QUERY HERE
+SELECT amount FROM spends WHERE amount BETWEEN 30000 and 31000;
 ```
 
 **Claire:** That's great, thanks. Hey, what about transactions that include the word 'fee' in their description?
@@ -68,39 +68,39 @@ INSERT YOUR QUERY HERE
 **You:** Then here's the query for that:
 
 ```sql
-INSERT YOUR QUERY HERE
+SELECT description FROM spends WHERE description ILIKE '%fee%';
 ```
 
 **Farnoosh:** Hi, it's me again. It turns out we also need the transactions that have the expense area of 'Better Hospital Food'. Can you help us with that one?
 
 **You:** No worries. Here's the query for that:
 
 ```sql
-INSERT YOUR QUERY HERE
+SELECT sp.id, sp.transaction_no, ex_a.expense_area FROM expense_areas AS ex_a JOIN spends AS sp ON ex_a.id = sp.expense_area_id WHERE expense_area = 'Better Hospital Food';
 ```
 
 **Claire:** Great, that's very helpful. How about the total amount spent for each month?
 
 **You:** You can get that by using the GROUP BY clause. Here's the query:
 
 ```sql
-CREATE YOUR QUERY HERE
+SELECT date, SUM(amount) AS monthly_costs FROM spends GROUP BY date;
 ```
 
 **Farnoosh:** Thanks, that's really useful. We also need to know the total amount spent on each supplier. Can you help us with that?
 
 **You:** Sure thing. Here's the query for that:
 
 ```sql
-INSERT YOUR QUERY HERE
+SELECT supplier_id, SUM(amount) AS cost_per_supplier FROM spends GROUP BY supplier_id;
 ```
 
 **Farnoosh:** Oh, how do I know who these suppliers are? There's only numbers here.
 
 **You:** Whoops! I gave you ids to key the totals, but let me give you names instead.
 
 ```sql
-INSERT YOUR QUERY HERE
+SELECT sp.supplier_id, su.supplier, SUM(sp.amount) AS cost_per_supplier FROM spends AS sp JOIN suppliers AS su ON sp.supplier_id = su.id GROUP BY sp.supplier_id, su.supplier;
 ```
 
 **Claire:** Thanks, that's really helpful. I can't quite figure out...what is the total amount spent on each of these two dates (1st March 2021 and 1st April 2021)?
@@ -112,7 +112,7 @@ INSERT YOUR QUERY HERE
 **You:** Then you need an extra clause. Here's the query:
 
 ```sql
-CREATE YOUR QUERY HERE
+SELECT date, SUM(amount) AS monthly_costs FROM spends WHERE date IN ('2021-03-01', '2021-04-01') GROUP BY date;
 ```
 
 **Farnoosh:** Fantastic. One last thing, looks like we missed something. Can we add a new transaction to the spends table with a description of 'Computer Hardware Dell' and an amount of £32,000?
@@ -124,7 +124,7 @@ CREATE YOUR QUERY HERE
 **You:** Sure thing. To confirm, the date is August 19, 2021, the transaction number is 38104091, the supplier invoice number is 3780119655, the supplier is 'Dell', the expense type is 'Hardware' and the expense area is 'IT'. Here's the query for that:
 
 ```sql
-INSERT YOUR QUERIES HERE
+INSERT INTO spends (expense_type_id, expense_area_id, supplier_id, date, amount, transaction_no, supplier_inv_no, description) VALUES (7, 18, 16, '2021-08-19', 32000, 38104091, '3780119655', 'Computer Hardware Dell');
 
 ```
 

E-Commerce/readme.md

@@ -45,17 +45,59 @@ erDiagram
 
 Write SQL queries to complete the following tasks:
 
-- [ ] List all the products whose name contains the word "socks"
-- [ ] List all the products which cost more than 100 showing product id, name, unit price, and supplier id
-- [ ] List the 5 most expensive products
-- [ ] List all the products sold by suppliers based in the United Kingdom. The result should only contain the columns product_name and supplier_name
-- [ ] List all orders, including order items, from customer named Hope Crosby
-- [ ] List all the products in the order ORD006. The result should only contain the columns product_name, unit_price, and quantity
-- [ ] List all the products with their supplier for all orders of all customers. The result should only contain the columns name (from customer), order_reference, order_date, product_name, supplier_name, and quantity
+- [x] List all the products whose name contains the word "socks"
+    SELECT * FROM products WHERE product_name ILIKE '%socks%';
+
+- [x] List all the products which cost more than 100 showing product id, name, unit price, and supplier id
+    SELECT p.id, p.product_name, pa.unit_price, pa.supp_id 
+    FROM products AS p 
+    JOIN product_availability AS pa 
+    ON p.id = pa.prod_id 
+    WHERE pa.unit_price > 100;
+
+- [x] List the 5 most expensive products
+   SELECT p.product_name, pa.unit_price 
+   FROM products AS p 
+   JOIN product_availability AS pa 
+   ON p.id = pa.prod_id 
+   GROUP BY p.product_name, pa.unit_price 
+   ORDER BY pa.unit_price DESC LIMIT 5;
+
+- [x] List all the products sold by suppliers based in the United Kingdom. The result should only contain the columns product_name and supplier_name
+    SELECT p.product_name, s.supplier_name
+    FROM products AS p 
+    JOIN product_availability AS pa ON p.id = pa.prod_id
+    JOIN suppliers AS s ON s.id = pa.supp_id
+    WHERE s.country = 'United Kingdom';
+
+- [x] List all orders, including order items, from customer named Hope Crosby
+        SELECT c.name, o.id, o.order_date, o.order_reference, p.product_name, oi.quantity
+        FROM orders AS o
+        JOIN order_items AS oi ON o.id = oi.order_id
+        JOIN products AS p ON oi.product_id = p.id
+        JOIN customers AS c ON o.customer_id = c.id
+        WHERE c.name = 'Hope Crosby';
+
+- [x] List all the products in the order ORD006. The result should only contain the columns product_name, unit_price, and quantity
+   SELECT p.product_name, pa.unit_price, oi.quantity
+   FROM orders AS o
+   JOIN order_items AS oi ON o.id = oi.order_id
+   JOIN products AS p ON p.id = oi.product_id
+   JOIN product_availability AS pa ON pa.prod_id = oi.product_id
+   WHERE o.order_reference = 'ORD006';
+
+- [x] List all the products with their supplier for all orders of all customers. The result should only contain the columns name (from customer), order_reference, order_date, product_name, supplier_name, and quantity
+   SELECT c.name, o.order_reference, o.order_date, p.product_name, s.supplier_name, oi.quantity
+   FROM orders AS o
+   JOIN customers AS c ON o.customer_id = c.id
+   JOIN order_items AS oi ON o.id = oi.order_id
+   JOIN products AS p ON oi.product_id = p.id
+   JOIN suppliers AS s ON oi.supplier_id = s.id
+   ORDER BY c.name, o.order_reference, p.product_name;
 
 ## Acceptance Criteria
 
-- [ ] The `cyf_ecommerce` database is imported and set up correctly
-- [ ] The database schema is drawn correctly to visualize relationships between tables
-- [ ] The SQL queries retrieve the correct data according to the tasks listed above
-- [ ] The pull request with the answers to the tasks is opened on the `main` branch of the `E-Commerce` repository
+- [x] The `cyf_ecommerce` database is imported and set up correctly
+- [x] The database schema is drawn correctly to visualize relationships between tables
+- [x] The SQL queries retrieve the correct data according to the tasks listed above
+- [x] The pull request with the answers to the tasks is opened on the `main` branch of the `E-Commerce` repository

queries.sql

@@ -0,0 +1,13 @@
+-- psql -U aisha -f queries.sql
+\c my_hotels;
+
+SELECT * FROM reservations WHERE room_no = 204;
+
+SELECT * FROM rooms WHERE room_no = 204;
+
+SELECT rate, room_type, checkout_date, rooms.room_no, reservations.room_no FROM reservations
+JOIN rooms ON reservations.room_no = rooms.room_no;
+
+
+
+