diff --git a/README.md b/README.md index 5200ed75..8d41fac4 100644 --- a/README.md +++ b/README.md @@ -1 +1,189 @@ -# Databases-Homework \ No newline at end of file +# Databases-Homework + +### Tasks + +1. Which rooms have a rate of more than 100.00? + +PREMIER +PREMIER PLUS +FAMILY + +2. List the reservations that have a checkin date this month and are for more than three nights. + +cyf_hotels=# select cust_id, room_no, checkout_date - checkin_date as nights from reservations where checkin_date > '2023-08-01' and (checkout_date - checkin_date) > 2; +cust_id | room_no | nights +---------+---------+-------- +4 | 312 | 3 +131 | 301 | 6 +117 | 101 | 4 +119 | | 5 +64 | | 3 +51 | | 4 +46 | | 4 +19 | | 5 +108 | | 3 +9 | 305 | 6 +91 | 211 | 5 +41 | 302 | 5 +106 | 206 | 5 +123 | | 4 +16 | | 6 +126 | | 5 +97 | | 3 +20 | | 4 +15 | | 4 +79 | | 3 +40 | | 3 +9 | | 3 +26 | | 3 +96 | | 6 +35 | | 5 +38 | | 5 +96 | | 5 +12 | | 3 +63 | | 5 +66 | | 3 +44 | | 4 +129 | | 4 +55 | | 4 +93 | | 4 +98 | | 6 +(35 rows) + +3. List all customers from cities that begin with the letter 'M'. + +cyf_hotels=# select \* from customers where city like 'M%'; +id | name | email | phone | address | city | postcode | country +-----+---------------------+------------------------------+--------------------+--------------------------------------------+-------------+----------+------------- +3 | Alice Evans | alice.evans001@hotmail.com | 0161 345 6789 | 3 High Road | Manchester | m13 4ef | UK +4 | Mohammed Trungpa | mo.trungpa@hotmail.com | 0161 456 7890 | 25 Blue Road | Manchester | M25 6GH | UK +6 | Nadia Sethuraman | nadia.sethuraman@mail.com | | 135 Green Street | Manchester | M10 4BG | UK +8 | Martín Sommer | martin.sommer@dfgg.net | (91) 555 22 82 | C/ Romero, 33 | Madrid | 28016 | Spain +9 | Laurence Lebihan | laurence.lebihan@xmzx.net | 91.24.4555 | 12, rue des Bouchers | Marseille | 13008 | France +14 | Peter Ferguson | peter.ferguson@mxnx.net | 03 9520 4555 | 636 St Kilda Road, Level 3 | Melbourne | 3004 | Australia +22 | Diego Freyre | diego.freyre@amyr.net | (91) 555 94 44 | C/ Moralzarzal, 86 | Madrid | 28034 | Spain +41 | Rachel Ashworth | rachel.ashworth@rzyb.net | (171) 555-1555 | Fauntleroy Circus | Manchester | EC2 5NT | UK +55 | Jean Fresnière | jean.fresnière@uxsm.net | (514) 555-8054 | 43 rue St. Laurent | Montréal | H1J 1C3 | Canada +56 | Alejandra Camino | alejandra.camino@omet.net | (91) 745 6555 | Gran Vía, 1 | Madrid | 28001 | Spain +66 | Peter Franken | peter.franken@fszx.net | 089-0877555 | Berliner Platz 43 | München | 80805 | Germany +88 | Jesus Fernandez | jesus.fernandez@cgxs.net | +34 913 728 555 | Merchants House, 27-30 Merchant's Quay | Madrid | 28023 | Spain +91 | Laurence Lebihan | laurence.lebihan@xmzx.net | 91.24.4555 | 12, rue des Bouchers | Marseille | 13008 | France +95 | Karin Josephs | karin.josephs@gyfv.net | 0251-555259 | Luisenstr. 48 | Münster | 44087 | Germany +103 | Arnold Cruz | arnold.cruz@awqa.net | +63 2 555 3587 | 15 McCallum Street, NatWest Center #13-03 | Makati City | 1227 MM | Philippines +105 | Akiko Shimamura | akiko.shimamura@pipl.net | +81 3 3584 0555 | 2-2-8 Roppongi | Minato-ku | 106-0032 | Japan +109 | Michael Donnermeyer | michael.donnermeyer@lvpk.net | +49 89 61 08 9555 | Hansastr. 15 | Munich | 80686 | Germany +118 | Martín Sommer | martín.sommer@wcoa.net | (91) 555 22 82 | C/ Araquil, 67 | Madrid | 28023 | Spain +121 | Carmen Anton | carmen.anton@bhmy.net | +34 913 728555 | c/ Gobelas, 19-1 Urb. La Florida | Madrid | 28023 | Spain +123 | Franco Ricotti | franco.ricotti@ycbk.net | +39 022515555 | 20093 Cologno Monzese, Alessandro Volta 16 | Milan | | Italy +125 | Hanna Moos | hanna.moos@fmga.net | 0621-08555 | Forsterstr. 57 | Mannheim | 68306 | Germany +(21 rows) + +4. Make a new room type of PENTHOUSE with a default rate of £185.00 + +cyf_hotels=# select \* from room_types; +room_type | def_rate +--------------+---------- +FAMILY | 123.00 +PREMIER | 110.00 +PREMIER PLUS | 123.00 +PREMIUM | 85.00 +PREMIUM PLUS | 98.00 +PENTHOUSE | 185.00 +(6 rows) + +5. Add new rooms, 501 and 502 as room type PENTHOUSE and set the room rate of each to the default value (as in the new room type). + +cyf_hotels=# insert into rooms (room_no, rate, room_type) values (501, 185.00, 'PENTHOUSE'), (502, 185.00, 'PENTHOUSE'); +INSERT 0 2 +cyf_hotels=# select \* from rooms; +room_no | rate | room_type | no_guests +---------+--------+--------------+----------- +101 | 85.00 | PREMIUM | 2 +102 | 85.00 | PREMIUM | 2 +103 | 85.00 | PREMIUM | 2 +104 | 85.00 | PREMIUM | 2 +105 | 85.00 | PREMIUM | 2 +106 | 85.00 | PREMIUM | 2 +107 | 85.00 | PREMIUM | 2 +108 | 98.00 | PREMIUM PLUS | 2 +109 | 98.00 | PREMIUM PLUS | 2 +110 | 98.00 | PREMIUM PLUS | 2 +111 | 98.00 | PREMIUM PLUS | 2 +112 | 98.00 | PREMIUM PLUS | 2 +201 | 85.00 | PREMIUM | 2 +202 | 85.00 | PREMIUM | 2 +203 | 85.00 | PREMIUM | 2 +204 | 85.00 | PREMIUM | 2 +205 | 85.00 | PREMIUM | 3 +206 | 85.00 | PREMIUM | 3 +207 | 85.00 | PREMIUM | 3 +208 | 98.00 | PREMIUM PLUS | 2 +209 | 98.00 | PREMIUM PLUS | 2 +210 | 98.00 | PREMIUM PLUS | 2 +211 | 98.00 | PREMIUM PLUS | 3 +212 | 98.00 | PREMIUM PLUS | 3 +301 | 110.00 | PREMIER | 2 +302 | 110.00 | PREMIER | 2 +303 | 110.00 | PREMIER | 2 +304 | 110.00 | PREMIER | 2 +305 | 110.00 | PREMIER | 2 +306 | 110.00 | PREMIER | 2 +307 | 110.00 | PREMIER | 2 +308 | 123.00 | PREMIER PLUS | 2 +309 | 123.00 | PREMIER PLUS | 2 +310 | 123.00 | PREMIER PLUS | 2 +311 | 123.00 | PREMIER PLUS | 2 +312 | 123.00 | PREMIER PLUS | 2 +401 | 110.00 | PREMIER | 2 +402 | 110.00 | PREMIER | 2 +403 | 110.00 | PREMIER | 2 +404 | 110.00 | PREMIER | 2 +405 | 110.00 | PREMIER | 2 +406 | 110.00 | PREMIER | 2 +407 | 110.00 | PREMIER | 2 +408 | 123.00 | PREMIER PLUS | 2 +409 | 123.00 | PREMIER PLUS | 2 +410 | 123.00 | PREMIER PLUS | 2 +411 | 123.00 | FAMILY | 4 +412 | 123.00 | FAMILY | 4 +501 | 185.00 | PENTHOUSE | + 502 | 185.00 | PENTHOUSE | +(50 rows) + +6. Add a new room 503 as a PREMIER PLUS type similar to the other PREMIER PLUS rooms in the hotel but with a room rate of 143.00 to reflect its improved views over the city. + + 412 | 123.00 | FAMILY | 4 + 501 | 185.00 | PENTHOUSE | + 502 | 185.00 | PENTHOUSE | + 503 | 143.00 | PREMIER PLUS | + + (51 rows) + +7. The hotel manager wishes to know how many rooms were occupied any time during the previous month - find that information. + +cyf_hotels=# select count (id) from reservations where checkin_date between '2023-07-01' and '2023-07-31'; +count + +--- + + 41 + +(1 row) + +8. Get the total number of nights that customers stayed in rooms on the second floor (rooms 201 - 299). + +cyf_hotels=# select floor, sum(nights) as total_nights from (select trunc(room_no/100) as floor, (checkout_date - checkin_date) as nights from reservations where trunc(room_no/100)=2 ) subquery group by floor; +floor | total_nights +-------+-------------- +2 | 63 +(1 row) + +9. How many invoices are for more than £300.00 and what is their grand total and average amount? + +cyf_hotels=# select count(\*) as invoices, sum(total) as grand_total, avg(total) as average_amount from invoices where total >= 300; +invoices | grand_total | average_amount +----------+-------------+---------------------- +25 | 12928.00 | 517.1200000000000000 +(1 row) + +10. Bonus Question: list the number of nights stay for each floor of the hotel (floor no is the hundreds part of room number, e.g. room **3**12 is on floor **3**) diff --git a/week-2/mandatory/2-ecommerce-db/task.md b/week-2/mandatory/2-ecommerce-db/task.md index c48d2286..7d60bac1 100644 --- a/week-2/mandatory/2-ecommerce-db/task.md +++ b/week-2/mandatory/2-ecommerce-db/task.md @@ -7,6 +7,7 @@ In this homework, you are going to work with an ecommerce database. In this data Below you will find a set of tasks for you to complete to set up a database for an e-commerce app. To submit this homework write the correct commands for each question here: + ```sql @@ -35,16 +36,212 @@ Open the file `cyf_ecommerce.sql` in VSCode and examine the SQL code. Take a pie Once you understand the database that you are going to work with, solve the following challenge by writing SQL queries using everything you learned about SQL: 1. Retrieve all the customers' names and addresses who live in the United States + +cyf_ecommerce=# select \* from customers where country = 'United States';; +id | name | address | city | country +----+--------------+----------------------------+------------------+--------------- +4 | Amber Tran | 6967 Ac Road | Villafranca Asti | United States +5 | Edan Higgins | Ap #840-3255 Tincidunt St. | Arles | United States +(2 rows) + 2. Retrieve all the customers in ascending name sequence + +cyf_ecommerce=# select \* from customers order by name; +id | name | address | city | country +----+--------------------+-----------------------------+------------------+---------------- +4 | Amber Tran | 6967 Ac Road | Villafranca Asti | United States +3 | Britanney Kirkland | P.O. Box 577, 5601 Sem, St. | Little Rock | United Kingdom +5 | Edan Higgins | Ap #840-3255 Tincidunt St. | Arles | United States +1 | Guy Crawford | 770-2839 Ligula Road | Paris | France +2 | Hope Crosby | P.O. Box 276, 4976 Sit Rd. | Steyr | United Kingdom +6 | Quintessa Austin | 597-2737 Nunc Rd. | Saint-Marc | United Kingdom +(6 rows) + 3. Retrieve all the products whose name contains the word `socks` + +cyf_ecommerce=# select \* from products where product_name like '%socks%'; +id | product_name +----+------------------ +4 | Super warm socks +(1 row) + 4. Retrieve all the products which cost more than 100 showing product id, name, unit price and supplier id. + +cyf_ecommerce=# SELECT product_availability.prod_id, product_availability.supp_id, product_availability.unit_price, products.product_name FROM product_availability +cyf_ecommerce-# JOIN products ON product_availability.prod_id=products.id +cyf_ecommerce-# WHERE product_availability.unit_price > 100; +prod_id | supp_id | unit_price | product_name +---------+---------+------------+---------------- +1 | 4 | 249 | Mobile Phone X +1 | 1 | 299 | Mobile Phone X +(2 rows) + 5. Retrieve the 5 most expensive products + +cyf_ecommerce=# select product_availability.prod_id, product_availability.supp_id, product_availability.unit_price, products.product_name from product_availability JOIN products ON product_availability.prod_id=products.id order by unit_price desc +cyf_ecommerce-# limit 5; +prod_id | supp_id | unit_price | product_name +---------+---------+------------+----------------- +1 | 1 | 299 | Mobile Phone X +1 | 4 | 249 | Mobile Phone X +2 | 2 | 41 | Javascript Book +2 | 1 | 40 | Javascript Book +2 | 3 | 39 | Javascript Book +(5 rows) + 6. Retrieve all the products with their corresponding suppliers. The result should only contain the columns `product_name`, `unit_price` and `supplier_name` + +cyf_ecommerce=# SELECT products.product_name, product_availability.unit_price, suppliers.supplier_name FROM products JOIN product_availability ON product_availability.prod_id=products.id JOIN suppliers ON suppliers.id=product_availability.supp_id; +product_name | unit_price | supplier_name +-------------------------+------------+--------------- +Mobile Phone X | 249 | Sainsburys +Mobile Phone X | 299 | Amazon +Javascript Book | 41 | Taobao +Javascript Book | 39 | Argos +Javascript Book | 40 | Amazon +Le Petit Prince | 10 | Sainsburys +Le Petit Prince | 10 | Amazon +Super warm socks | 10 | Sainsburys +Super warm socks | 8 | Argos +Super warm socks | 5 | Taobao +Super warm socks | 10 | Amazon +Coffee Cup | 5 | Sainsburys +Coffee Cup | 4 | Argos +Coffee Cup | 4 | Taobao +Coffee Cup | 3 | Amazon +Ball | 20 | Taobao +Ball | 15 | Sainsburys +Ball | 14 | Amazon +Tee Shirt Olympic Games | 21 | Argos +Tee Shirt Olympic Games | 18 | Taobao +Tee Shirt Olympic Games | 20 | Amazon +(21 rows) + 7. Retrieve all the products sold by suppliers based in the United Kingdom. The result should only contain the columns `product_name` and `supplier_name`. -8. Retrieve all orders, including order items, from customer ID `1`. Include order id, reference, date and total cost (calculated as quantity * unit price). + +cyf_ecommerce=# SELECT products.product_name, suppliers.supplier_name FROM products JOIN product_availability ON product_availability.prod_id=products.id JOIN suppliers ON suppliers.id=product_availability.supp_id WHERE suppliers.country = 'United Kingdom'; +product_name | supplier_name +-------------------------+--------------- +Javascript Book | Argos +Super warm socks | Argos +Coffee Cup | Argos +Tee Shirt Olympic Games | Argos +Mobile Phone X | Sainsburys +Le Petit Prince | Sainsburys +Super warm socks | Sainsburys +Coffee Cup | Sainsburys +Ball | Sainsburys +(9 rows) + +8. Retrieve all orders, including order items, from customer ID `1`. Include order id, reference, date and total cost (calculated as quantity \* unit price). + +cyf_ecommerce=# SELECT +cyf_ecommerce-# orders.id, +cyf_ecommerce-# orders.order_reference, +cyf_ecommerce-# orders.order_date, +cyf_ecommerce-# SUM(order_items.quantity \* product_availability.unit_price) as total_cost +cyf_ecommerce-# FROM orders +cyf_ecommerce-# JOIN order_items ON orders.id = order_items.order_id +cyf_ecommerce-# JOIN product_availability ON order_items.product_id = product_availability.prod_id +cyf_ecommerce-# AND order_items.supplier_id = product_availability.supp_id +cyf_ecommerce-# WHERE orders.customer_id = 1 +cyf_ecommerce-# GROUP BY orders.id, orders.order_reference, orders.order_date; +id | order_reference | order_date | total_cost +----+-----------------+------------+------------ +1 | ORD001 | 2019-06-01 | 43 +2 | ORD002 | 2019-07-15 | 42 +3 | ORD003 | 2019-07-11 | 80 +(3 rows) + 9. Retrieve all orders, including order items, from customer named `Hope Crosby` + +cyf_ecommerce=# SELECT +cyf_ecommerce-# customers.id, +cyf_ecommerce-# customers.name, +cyf_ecommerce-# orders.order_reference, +cyf_ecommerce-# order_items.quantity +cyf_ecommerce-# FROM customers +cyf_ecommerce-# JOIN orders ON customers.id = orders.customer_id +cyf_ecommerce-# JOIN order_items ON orders.id = order_items.order_id +cyf_ecommerce-# WHERE customers.name = 'Hope Crosby'; +id | name | order_reference | quantity +----+-------------+-----------------+---------- +2 | Hope Crosby | ORD004 | 1 +(1 row) + 10. Retrieve all the products in the order `ORD006`. The result should only contain the columns `product_name`, `unit_price` and `quantity`. + +cyf_ecommerce=# SELECT order_items.order_id, order_items.quantity, products.product_name, product_availability.unit_price FROM order_items JOIN products ON order_items.product_id=products.id JOIN product_availability ON order_items.product_id=product_availability.prod_id AND order_items.supplier_id=product_availability.supp_id WHERE order_items.order_id = 6; +order_id | quantity | product_name | unit_price +----------+----------+------------------+------------ +6 | 1 | Javascript Book | 41 +6 | 1 | Le Petit Prince | 10 +6 | 3 | Super warm socks | 10 +6 | 3 | Coffee Cup | 4 +(4 rows) + 11. Retrieve 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`. + +cyf_ecommerce=# SELECT suppliers.supplier_name, order_items.order_id, order_items.quantity, orders.order_date, customers.name, products.product_name FROM suppliers JOIN order_items ON order_items.supplier_id=suppliers.id JOIN orders ON order_items.order_id=orders.id JOIN customers ON orders.customer_id=customers.id JOIN products ON order_items.product_id = products.id; +supplier_name | order_id | quantity | order_date | name | product_name +---------------+----------+----------+------------+--------------------+------------------------- +Taobao | 1 | 1 | 2019-06-01 | Guy Crawford | Tee Shirt Olympic Games +Taobao | 1 | 5 | 2019-06-01 | Guy Crawford | Super warm socks +Argos | 2 | 4 | 2019-07-15 | Guy Crawford | Super warm socks +Sainsburys | 2 | 1 | 2019-07-15 | Guy Crawford | Le Petit Prince +Argos | 3 | 10 | 2019-07-11 | Guy Crawford | Coffee Cup +Taobao | 3 | 2 | 2019-07-11 | Guy Crawford | Ball +Amazon | 4 | 1 | 2019-05-24 | Hope Crosby | Mobile Phone X +Argos | 5 | 2 | 2019-05-30 | Britanney Kirkland | Javascript Book +Amazon | 5 | 1 | 2019-05-30 | Britanney Kirkland | Le Petit Prince +Taobao | 6 | 3 | 2019-07-05 | Amber Tran | Coffee Cup +Taobao | 6 | 1 | 2019-07-05 | Amber Tran | Javascript Book +Sainsburys | 6 | 1 | 2019-07-05 | Amber Tran | Le Petit Prince +Sainsburys | 6 | 3 | 2019-07-05 | Amber Tran | Super warm socks +Argos | 7 | 15 | 2019-04-05 | Amber Tran | Super warm socks +Amazon | 8 | 1 | 2019-07-23 | Edan Higgins | Tee Shirt Olympic Games +Sainsburys | 8 | 1 | 2019-07-23 | Edan Higgins | Mobile Phone X +Sainsburys | 9 | 2 | 2019-07-24 | Edan Higgins | Ball +Taobao | 10 | 1 | 2019-05-10 | Edan Higgins | Ball +Amazon | 10 | 5 | 2019-05-10 | Edan Higgins | Super warm socks +(19 rows) + 12. Retrieve the names of all customers who bought a product from a supplier based in China. -13. List all orders giving customer name, order reference, order date and order total amount (quantity * unit price) in descending order of total. + cyf_ecommerce=# SELECT suppliers.supplier_name, order_items.order_id, orders.order_reference, customers.name FROM suppliers JOIN order_items ON order_items.supplier_id=suppliers.id JOIN orders ON order_items.order_id=orders.id JOIN customers ON orders.customer_id=customers.id + cyf_ecommerce-# WHERE suppliers.country = 'China'; + supplier_name | order_id | order_reference | name + ---------------+----------+-----------------+-------------- + Taobao | 1 | ORD001 | Guy Crawford + Taobao | 1 | ORD001 | Guy Crawford + Taobao | 3 | ORD003 | Guy Crawford + Taobao | 6 | ORD006 | Amber Tran + Taobao | 6 | ORD006 | Amber Tran + Taobao | 10 | ORD010 | Edan Higgins + (6 rows) + +13. List all orders giving customer name, order reference, order date and order total amount (quantity \* unit price) in descending order of total. + +cyf_ecommerce=# SELECT customers.name, orders.order_reference, orders.order_date, order_items.quantity, order_items.product_id, product_availability.unit_price, (order_items.quantity \* product_availability.unit_price) as total_cost FROM customers JOIN orders ON customers.id=orders.customer_id JOIN order_items ON order_items.order_id=orders.id JOIN product_availability ON order_items.supplier_id=product_availability.supp_id AND order_items.product_id=product_availability.prod_id ORDER BY total_cost DESC; +name | order_reference | order_date | quantity | product_id | unit_price | total_cost +--------------------+-----------------+------------+----------+------------+------------+------------ +Hope Crosby | ORD004 | 2019-05-24 | 1 | 1 | 299 | 299 +Edan Higgins | ORD008 | 2019-07-23 | 1 | 1 | 249 | 249 +Amber Tran | ORD007 | 2019-04-05 | 15 | 4 | 8 | 120 +Britanney Kirkland | ORD005 | 2019-05-30 | 2 | 2 | 39 | 78 +Edan Higgins | ORD010 | 2019-05-10 | 5 | 4 | 10 | 50 +Amber Tran | ORD006 | 2019-07-05 | 1 | 2 | 41 | 41 +Guy Crawford | ORD003 | 2019-07-11 | 10 | 5 | 4 | 40 +Guy Crawford | ORD003 | 2019-07-11 | 2 | 6 | 20 | 40 +Guy Crawford | ORD002 | 2019-07-15 | 4 | 4 | 8 | 32 +Edan Higgins | ORD009 | 2019-07-24 | 2 | 6 | 15 | 30 +Amber Tran | ORD006 | 2019-07-05 | 3 | 4 | 10 | 30 +Guy Crawford | ORD001 | 2019-06-01 | 5 | 4 | 5 | 25 +Edan Higgins | ORD008 | 2019-07-23 | 1 | 7 | 20 | 20 +Edan Higgins | ORD010 | 2019-05-10 | 1 | 6 | 20 | 20 +Guy Crawford | ORD001 | 2019-06-01 | 1 | 7 | 18 | 18 +Amber Tran | ORD006 | 2019-07-05 | 3 | 5 | 4 | 12 +Amber Tran | ORD006 | 2019-07-05 | 1 | 3 | 10 | 10 +Britanney Kirkland | ORD005 | 2019-05-30 | 1 | 3 | 10 | 10 +Guy Crawford | ORD002 | 2019-07-15 | 1 | 3 | 10 | 10 +(19 rows) diff --git a/week-2/mandatory/3-api/.gitignore b/week-2/mandatory/3-api/.gitignore new file mode 100644 index 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b/week-2/mandatory/3-api/package.json @@ -0,0 +1,18 @@ +{ + "name": "3-api", + "version": "1.0.0", + "description": "", + "main": "server.js", + "scripts": { + "test": "echo \"Error: no test specified\" && exit 1", + "start": "nodemon server.js" + }, + "keywords": [], + "author": "", + "license": "ISC", + "dependencies": { + "express": "^4.18.2", + "nodemon": "^3.0.1", + "pg": "^8.11.3" + } +} diff --git a/week-2/mandatory/3-api/routes.js b/week-2/mandatory/3-api/routes.js new file mode 100644 index 00000000..4e07e014 --- /dev/null +++ b/week-2/mandatory/3-api/routes.js @@ -0,0 +1,44 @@ +const express = require("express"); + +const router = express.Router(); +const db = require("./db"); + +router.get("/customers", async (req, res) => { + try { + const result = await db.query("SELECT * FROM customers"); + res.json(result.rows); + } catch (error) { + console.error(error); + res.status(500).json({ error: "An error occurred" }); + } +}); + +router.get("/suppliers", async (req, res) => { + try { + const result = await db.query("SELECT * FROM suppliers"); + res.json(result.rows); + } catch (error) { + console.error(error); + res.status(500).json({ error: "An error occurred" }); + } +}); + +router.get("/products", async (req, res) => { + try { + const result = await db.query( + "SELECT \ + products.id, products.product_name, \ + product_availability.unit_price, \ + suppliers.supplier_name \ + FROM products \ + JOIN product_availability ON products.id=product_availability.prod_id \ + JOIN suppliers ON product_availability.supp_id=suppliers.id;" + ); + res.json(result.rows); + } catch (error) { + console.error(error); + res.status(500).json({ error: "An error occurred" }); + } +}); + +module.exports = router; diff --git a/week-2/mandatory/3-api/server.js b/week-2/mandatory/3-api/server.js new file mode 100644 index 00000000..b7c5a22d --- /dev/null +++ b/week-2/mandatory/3-api/server.js @@ -0,0 +1,10 @@ +const express = require("express"); +const app = express(); + +const routes = require("./routes"); + +app.use(routes); + +app.listen(process.env.PORT || 8000, () => { + console.log("Server is live on port: " + (process.env.PORT || 8000)); +});