From 12cd40dc2c590fdd8e1b651189a9c85843faaee8 Mon Sep 17 00:00:00 2001 From: leilafaez Date: Fri, 10 Feb 2023 14:03:45 +0000 Subject: [PATCH 1/3] Complete exercise 2 for sql queries --- .gitignore | 130 ++++++++++++++++++++++++++++++++++++++++++++ 2-exercises/task.md | 37 +++++++++++++ 2 files changed, 167 insertions(+) create mode 100644 .gitignore diff --git a/.gitignore b/.gitignore new file mode 100644 index 00000000..c6bba591 --- /dev/null +++ b/.gitignore @@ -0,0 +1,130 @@ +# Logs +logs +*.log +npm-debug.log* +yarn-debug.log* +yarn-error.log* +lerna-debug.log* +.pnpm-debug.log* + +# Diagnostic reports (https://nodejs.org/api/report.html) +report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json + +# Runtime data +pids +*.pid +*.seed +*.pid.lock + +# Directory for instrumented libs generated by jscoverage/JSCover +lib-cov + +# Coverage directory used by tools like istanbul +coverage +*.lcov + +# nyc test coverage +.nyc_output + +# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files) +.grunt + +# Bower dependency directory (https://bower.io/) +bower_components + +# node-waf configuration +.lock-wscript + +# Compiled binary addons (https://nodejs.org/api/addons.html) +build/Release + +# Dependency directories +node_modules/ +jspm_packages/ + +# Snowpack dependency directory (https://snowpack.dev/) +web_modules/ + +# TypeScript cache +*.tsbuildinfo + +# Optional npm cache directory +.npm + +# Optional eslint cache +.eslintcache + +# Optional stylelint cache +.stylelintcache + +# Microbundle cache +.rpt2_cache/ +.rts2_cache_cjs/ +.rts2_cache_es/ +.rts2_cache_umd/ + +# Optional REPL history +.node_repl_history + +# Output of 'npm pack' +*.tgz + +# Yarn Integrity file +.yarn-integrity + +# dotenv environment variable files +.env +.env.development.local +.env.test.local +.env.production.local +.env.local + +# parcel-bundler cache (https://parceljs.org/) +.cache +.parcel-cache + +# Next.js build output +.next +out + +# Nuxt.js build / generate output +.nuxt +dist + +# Gatsby files +.cache/ +# Comment in the public line in if your project uses Gatsby and not Next.js +# https://nextjs.org/blog/next-9-1#public-directory-support +# public + +# vuepress build output +.vuepress/dist + +# vuepress v2.x temp and cache directory +.temp +.cache + +# Docusaurus cache and generated files +.docusaurus + +# Serverless directories +.serverless/ + +# FuseBox cache +.fusebox/ + +# DynamoDB Local files +.dynamodb/ + +# TernJS port file +.tern-port + +# Stores VSCode versions used for testing VSCode extensions +.vscode-test + +# yarn v2 +.yarn/cache +.yarn/unplugged +.yarn/build-state.yml +.yarn/install-state.gz +.pnp.* diff --git a/2-exercises/task.md b/2-exercises/task.md index c48d2286..e1bcbbf9 100644 --- a/2-exercises/task.md +++ b/2-exercises/task.md @@ -35,16 +35,53 @@ 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 + + select name,address from customers where country='United States'; + 2. Retrieve all the customers in ascending name sequence + +select * from customers order by name ASC; + 3. Retrieve all the products whose name contains the word `socks` + + select * from products where product_name like '%socks%'; + 4. Retrieve 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 p inner join product_availability pa on (p.id=pa.prod_id) where pa.unit_price >100; + 5. Retrieve the 5 most expensive products + + select p.product_name, pa.unit_price from products p inner join product_availability pa on (p.id=pa.prod_id) order by pa.unit_price DESC limit 5; + 6. Retrieve all the products with their corresponding suppliers. The result should only contain the columns `product_name`, `unit_price` and `supplier_name` + + select p.product_name, pa.unit_price,s.supplier_name from products p inner join product_availability pa on (p.id=pa.prod_id) inner join suppliers s on (s.id=pa.supp_id); + 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`. + +select p.product_name, s.supplier_name from products p inner join product_availability pa on (p.id=pa.prod_id) inner join suppliers s on (s.id=pa.supp_id) where s.country='United Kingdom'; + 8. Retrieve all orders, including order items, from customer ID `1`. Include order id, reference, date and total cost (calculated as quantity * unit price). + +select o.id,o.order_reference,o.order_date,oi.quantity*pa.unit_price as total from orders o inner join order_items oi on (o.id=oi.order_id) inner join product_availability pa on (pa.prod_id = oi.product_id) where o.customer_id=1; + 9. Retrieve all orders, including order items, from customer named `Hope Crosby` + +select o.id, oi.product_id,oi.supplier_id,oi.quantity from orders o inner join order_items oi on (o.id=oi.order_id) inner join customers on (customers.id=o.customer_id) where customers.name='Hope Crosby'; + 10. Retrieve 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 products p inner join product_availability pa on (p.id = pa.prod_id) inner join order_items oi ON (pa.prod_id = oi.product_id) inner join orders on (oi.order_id = orders.id) where orders.order_reference = 'ORD006'; + 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`. + +select c.name, o.order_reference, o.order_date, p.product_name, s.supplier_name, oi.quantity FROM customers c inner Join orders o on (c.id = o.customer_id) inner join order_items oi on (o.id = oi.order_id) inner join product_availability a ON (a.prod_id = oi.product_id) inner JOIN products p ON (p.id = a.prod_id) inner join suppliers s ON (s.id = a.supp_id); + 12. Retrieve the names of all customers who bought a product from a supplier based in China. + + select c.name FROM customers c inner Join orders o on (c.id = o.customer_id) inner join order_items oi on (o.id = oi.order_id) inner join product_availability a ON (a.prod_id = oi.product_id) inner JOIN suppliers s ON (s.id = a.supp_id)where s.country = 'China'; + 13. List all orders giving customer name, order reference, order date and order total amount (quantity * unit price) in descending order of total. + select c.name, o.order_reference, o.order_date, (a.unit_price * oi.quantity) AS total_amount FROM customers c inner Join orders o on (c.id = o.customer_id) inner join order_items oi on (o.id = oi.order_id) inner join product_availability a ON (a.prod_id = oi.product_id); \ No newline at end of file From 59d3d68bab64cb4aef569aea97632e349b0dc9f0 Mon Sep 17 00:00:00 2001 From: leilafaez Date: Fri, 10 Feb 2023 16:06:26 +0000 Subject: [PATCH 2/3] Complete task 3 for project --- 3-projects/package-lock.json | 1251 ++++++++++++++++++++++++++++++++++ 3-projects/package.json | 6 + 3-projects/server.js | 35 + 3 files changed, 1292 insertions(+) create mode 100644 3-projects/package-lock.json create mode 100644 3-projects/package.json create mode 100644 3-projects/server.js diff --git a/3-projects/package-lock.json b/3-projects/package-lock.json new file 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host:'localhost', + database:'cyf_ecommerce', + password:'leila6925', + port:5432 +}) + + +app.get("/customers",(req,res)=>{ + db.query('select * from customers',(err,result)=>{ + res.json(result.rows); + }) +}) +app.get("/suppliers",(req,res)=>{ + db.query('select * from suppliers',(err,result)=>{ + res.json(result.rows) + }) +}) + +app.get("/products", (req, res) => { + db.query( + "select p.product_name, pa.unit_price,s.supplier_name from products p inner join product_availability pa on (p.id=pa.prod_id) inner join suppliers s on (s.id=pa.supp_id)", + (err, result) => { + res.json(result.rows) + } + ); +}); +app.listen(3000, function () { + console.log("Server is listening on port 3000. Ready to accept requests!"); +}); From cd2a4ff17881b2707166b4d2f47b198b57de77a3 Mon Sep 17 00:00:00 2001 From: leilafaez Date: Sat, 18 Feb 2023 20:11:00 +0000 Subject: [PATCH 3/3] Complete sql-coursework-week3 --- 3-projects/server.js | 137 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 136 insertions(+), 1 deletion(-) diff --git a/3-projects/server.js b/3-projects/server.js index 1d9553ac..8df227fc 100644 --- a/3-projects/server.js +++ b/3-projects/server.js @@ -1,6 +1,9 @@ const express = require("express"); const app = express(); const {Pool}=require('pg'); +const bodyParser =require("body-parser") + +app.use(bodyParser.json()) const db=new Pool({ user:'postgres', @@ -10,7 +13,16 @@ const db=new Pool({ port:5432 }) - +app.get("customers/:id", (req, res) => { + let custId = parseInt(req.params.id); + db.query( + `SELECT * FROM customers WHERE id = $1`, + [custId], + function (err, result) { + result.json(); + } + ); +}); app.get("/customers",(req,res)=>{ db.query('select * from customers',(err,result)=>{ res.json(result.rows); @@ -30,6 +42,129 @@ app.get("/products", (req, res) => { } ); }); + +app.get("/products", (req,res)=>{ + let prName = req.params.product_name + db.query( + ` + SELECT products.product_name, product_availability.unit_price, suppliers.supplier_name + FROM products + INNER JOIN product_availability + ON products.id = product_availability.prod_id + INNER JOIN suppliers + ON product_availability.supp_id = suppliers.id + WHERE products.product_name ILIKE $1`, [`%${prName}%`], + function (err, result) { + result.json(res.rows); + } + ); +}) + +app.post("/customers",(req,res)=>{ + const customer = req.body; + const query = + "INSERT INTO customers (name,address,city,country) " + + "VALUES ($1,$3, $4, $5)"; + + db.query(query, [customer], (err) => { + res.send("Customer created!"); + }) +}) + +app.post("/products", (req, res) => { + const product = req.body; + const query = + "INSERT INTO products (product_name) " + + "VALUES ($1)"; + + db.query(query, [product], (err) => { + res.send("product created!"); + }); +}); + +app.post("/availability",(req,res)=>{ + const prodId = req.body.productId + const price = req.body.price + const suppId= req.body.supplierId + + if(price<0 || typeof price !=="number"){ + return res.status(400).send("wrong price format") + } + const query = "select 1 from products where id=$1" + db.query(query,[prodId],(err,result)=>{ + if(result.rowCount<=0){ + return res.status(400).send("the productId not found") + } + db.query( `INSERT INTO product_availability (prod_id, supp_id, unit_price) + VALUES($1, $2, $3)`,[prodId,price,suppId],res.send("product availability created!")) + }) +}); + + + app.post('/customers/:customerId/orders', async (req, res) => { + const customerId = req.params.customer_id; + const { order_date, order_reference } = req.body; + + const customerResult = await db.query('SELECT * FROM customers WHERE id = $1', [customerId]); + const customer = customerResult.rows[0]; + if (!customer) { + return res.status(404).json({ error: 'Customer not found' }); + } + const orderResult = await db.query( + "INSERT INTO orders (order_date, order_reference, customer_id) VALUES ($1, $2, $3) RETURNING *", + [order_date, order_reference, customerId] + ); + const order = orderResult.rows[0]; + + return res.json(order); +}); + +app.delete("/customers/:customerId", async (req, res) => { + const customerId = req.params.customer_id; + const customerResult = await db.query( + "SELECT * FROM customers WHERE id = $1", + [customerId] + ); + const customer = customerResult.rows[0]; + if (!customer) { + return res.status(404).json({ error: "Customer not found" }); + } + + const orderResult = await db.query( + "SELECT * FROM orders WHERE customer_id = $1", + [customerId] + ); + const orders = orderResult.rows; + if (orders.length > 0) { + return res + .status(400) + .json({ error: "Customer has orders and cannot be deleted" }); + } + await db.query("DELETE FROM customers WHERE id = $1", [customerId]); + return res.status(204).send("customer record deleted"); +}); + +app.put("/customers/:customerId", async (req, res) => { + const customerId = req.params.customer_id; + const { name, address, city, country } = req.body; + + const customerResult = await db.query( + "SELECT * FROM customers WHERE id = $1", + [customerId] + ); + const customer = customerResult.rows[0]; + if (!customer) { + return res.status(404).json({ error: "Customer not found" }); + } + + await db.query( + "UPDATE customers SET name = $1, address = $2, city = $3, country = $4 WHERE id = $5", + [name, address, city, country, customerId] + ); + + return res.status(204).send("customer record updated"); +}); + app.listen(3000, function () { console.log("Server is listening on port 3000. Ready to accept requests!"); });