Sql week2 nihal

week-1/mandatory/2-classes-db/task.md

@@ -8,6 +8,81 @@ To submit this homework write the correct commands for each question here:
 
 ```sql
 
+CREATE DATABASE cyf_classes;
+
+//Create the mentors table:
+
+CREATE TABLE mentors ( 
+id SERIAL PRIMARY KEY, name varchar(200) NOT NULL, years_in_Glasgow INT(100) NOT NULL, address varchar(300) NOT NULL, favourate_programming_language varchar(100) NOT NULL
+);
+
+//Insert the mentors data:
+
+INSERT INTO mentors values(1,'ola', 10, 'London', 'JavaScript'),
+(2, 'Donald', 4, 'glasgow', 'C'),
+(3,'Martin', 11, 'Birmingham', 'Java'),
+(4,'Sanna', 6, 'London', 'C'),
+(5,'Hind', 1, 'Bristol', 'C');
+
+//Create the student table:
+
+CREATE TABLE student (
+name varchar (100) NOT NULL, address varchar(300) NOT NULL, graduated BOOLEAN NOT NULL
+
+);
+
+// Insert student data:
+
+INT INTO student values ('Noor', 'Ladywood' , False),
+('Lama', 'Birmingham' , False),
+('Nihal', 'Manchester' , True),
+('Omar', 'London' , True),
+('Sozan', 'London' , False),
+('Dorman', 'Darby' , False),
+('Soliman', 'Lister' , True),
+('Sammar', 'Lister' , False),
+('Hossain', 'London' , True),
+('Ali', 'Birmingham' , True),
+('Rana', 'Birmingham' , False);
+
+// Select from the student table:
+
+select\*from students;
+
+
+// Create classes table:
+
+CREATE TABLE classes ( 
+id SERIAL PRIMARY KEY, leading_mentor varchar(100), topic varchar(300) primary key, class_date date, class_location varchar(300) 
+
+);
+
+//Insert the data:
+
+INSERT INTO classes values(1,'Noorhan', 'C++', '01-02-2021', 'center building'),
+(2, 'Ali', 'Node JS', '01-02-2021', 'main tower'),
+(3, 'Susan', 'JavaScrept', '28-08-2020', ' main tower'),
+(4, 'Ala', 'C++', '01-12-2020', 'CLT building'),
+(5, 'Flora', 'Java', '01-03-2020', 'center building'),
+(6, 'Mosa', 'C++', '20-05-2020', ' center building');
+
+g
+//9-Create table to show students attends:
+
+CREATE TABLE student_attends (student_id INT REFERENCES student(id),class_id INT REFERENCES classes(id));
+INSERT INTO student_attends(student_id,class_id)values
+(0,1),
+(8,1),
+(3,3)
+(1,0);
+
+//select from mentor:
+select * from mentor where years_in_Glasgow > 5;
+select * from mentor where favourate_programming_language = 'JavasCript';
+select * from student where graduated = True;
+select * from classes where class_date < '2020-06-01';
+select * from student_attends where topic = 'Node JS';
+
 
 ```
 
@@ -16,22 +91,23 @@ When you have finished all of the questions - open a pull request with your answ
 ## Task
 
 1. Create a new database called `cyf_classes` (hint: use `createdb` in the terminal)
-2. Create a new table `mentors`, for each mentor we want to save their name, how many years they lived in Glasgow, their address and their favourite programming language.
+2. Create a new table `mentors`, for each mentor we want to save their name, how many years they lived in mentors, their address and their favourite programming language.
 3. Insert 5 mentors in the `mentors` table (you can make up the data, it doesn't need to be accurate ;-)).
 4. Create a new table `students`, for each student we want to save their name, address and if they have graduated from Code Your Future.
 5. Insert 10 students in the `students` table.
 6. Verify that the data you created for mentors and students are correctly stored in their respective tables (hint: use a `select` SQL statement).
 7. Create a new `classes` table to record the following information:
 
-   - A class has a leading mentor
-   - A class has a topic (such as Javascript, NodeJS)
-   - A class is taught at a specific date and at a specific location
+- A class has a leading mentor
+- A class has a topic (such as Javascript, NodeJS)
+- A class is taught at a specific date and at a specific location
 
 8. Insert a few classes in the `classes` table
 9. We now want to store who among the students attends a specific class. How would you store that? Come up with a solution and insert some data if you model this as a new table.
 10. Answer the following questions using a `select` SQL statement:
-    - Retrieve all the mentors who lived more than 5 years in Glasgow
-    - Retrieve all the mentors whose favourite language is Javascript
-    - Retrieve all the students who are CYF graduates
-    - Retrieve all the classes taught before June this year
-    - Retrieve all the students (retrieving student ids only is fine) who attended the Javascript class (or any other class that you have in the `classes` table).
+- Retrieve all the mentors who lived more than 5 years in Glasgow
+- Retrieve all the mentors whose favourite language is Javascript
+- Retrieve all the students who are CYF graduates
+- Retrieve all the classes taught before June this year
+- Retrieve all the students (retrieving student ids only is fine) who attended the Javascript class (or any other class that you have in the `classes` table).
+

week-2/mandatory/2-ecommerce-db/task.md

@@ -9,6 +9,33 @@ Below you will find a set of tasks for you to complete to set up a databases of
 To submit this homework write the correct commands for each question here:
 
 ```sql
+1-SELECT name, address FROM customers WHERE country = 'United States';
+2-SELECT * FROM customers ORDER BY name; 
+3- SELECT * FROM products WHERE unit_price > 100;
+4- SELECT * FROM products WHERE product_name LIKE '%socks%';
+5- SELECT * FROM products ORDER BY unit_price DESC LIMIT 5; 
+6-SELECT products.product_name, products.unit_price, suppliers.supplier_name FROM products 
+    INNER JOIN suppliers ON suppliers.id = products.supplier_id;
+7-SELECT products.product_name,suppliers.supplier_name From products              
+    INNER JOIN suppliers ON suppliers.id = products.supplier_id 
+    WHERE country = 'United Kingdom';
+8-SELECT * FROM orders WHERE customer_id = '1';
+9-SELECT customers.name,customers.id, orders.order_reference FROM orders
+    INNER JOIN customers ON customers.id = orders.customer_id
+    where customers.name = 'Hope Crosby';
+10-SELECT products.product_name, products.unit_price, order_items.quantity,
+11- SELECT customers.name, orders.order_reference, orders.order_date , products.product_name, suppliers.supplier_name, order_items.quantity    from orders
+    INNER JOIN order_items ON  order_items.id = orders.id
+    INNER JOIN products ON  products.id = order_items.product_id 
+    INNER JOIN suppliers ON  suppliers.id = products.supplier_id 
+    INNER JOIN customers ON customers.id = orders.customer_id;
+
+12- SELECT customers.name, suppliers.country    FROM orders                              
+    INNER JOIN order_items ON  order_items.id = orders.id
+    INNER JOIN products ON  products.id = order_items.product_id
+    INNER JOIN suppliers ON  suppliers.id = products.supplier_id 
+    INNER JOIN customers ON customers.id = orders.customer_id 
+    WHERE suppliers.country = 'China';
 
 
 ```

week-2/mandatory/3-api/package.json

@@ -0,0 +1,19 @@
+{
+    "name": "cyf-ecomerce-api",
+    "version": "1.0.0",
+    "description": "",
+    "main": "server.js",
+    "dependencies": {
+      "dotenv": "^8.2.0",
+      "express": "^4.17.1",
+      "pg": "^8.5.1"
+    },
+    "devDependencies": {},
+    "scripts": {
+      "test": "echo \"Error: no test specified\" && exit 1",
+      "start": "node server.js"
+    },
+    "author": "",
+    "license": "ISC"
+  }
+

week-2/mandatory/3-api/sever.js

@@ -0,0 +1,34 @@
+const express = require("express");
+const app = express();
+const { Pool } = require('pg');
+require('dotenv').config()
+
+const pool = new Pool({
+    user: process.env.USERNAME,
+    host: 'localhost',
+    database: 'cyf_ecommerce',
+    password: process.env.PASSWORD,
+    port: 5432
+});
+
+app.get("/customers", function(req, res) {
+    pool.query('SELECT * FROM customers', (error, result) => {
+        res.json(result.rows);
+    });
+ });
+
+    app.get("/suppliers", function(req, res) {
+    pool.query('SELECT * FROM suppliers', (error, result) => {
+        res.json(result.rows);
+    });
+});
+
+app.get("/products", function(req, res) {
+    pool.query('SELECT products.product_name, suppliers.supplier_name FROM products INNER JOIN suppliers ON suppliers.id = products.supplier_id', (error, result) => {
+        res.json(result.rows);
+    });
+});
+
+app.listen(3000, function() {
+    console.log("Server is listening on port 3000. Ready to accept requests!");
+});