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add 07_tables.sql 07_where_clause.sql
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‎07_tables.sql

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-- Select Database
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drop database test_db;
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create database test_db;
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use test_db;
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-- Employees Table
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drop table if exists employees;
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CREATE TABLE employees (
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employee_id INT PRIMARY KEY,
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first_name VARCHAR(40) NOT NULL,
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last_name VARCHAR(40),
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email VARCHAR(100) NOT NULL,
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hire_date DATE NOT NULL,
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salary DECIMAL(10 , 2 ) NOT NULL DEFAULT 25000.00
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);
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insert into employees(employee_id,first_name,last_name,email,hire_date,salary)
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values (1,'Michael',NULL,'[email protected]','2022-04-13',84630),
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(2,'Trevor','Philips','[email protected]','2022-04-21',25447),
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(3,'Franklin','Clinton','[email protected]','2022-04-21',30880),
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(4,'Wade','Hebert','[email protected]','2022-06-13',83835),
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(5,'Lester','Crest','[email protected]','2022-07-21',30586),
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(6,'Devin','Weston','[email protected]','2022-08-27',58948),
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(7,'Solomon','Richards','[email protected]','2022-08-27',57935),
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(8,'Jimmy',NULL,'[email protected]','2021-04-22',45375),
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(9,'Amanda',NULL,'[email protected]','2022-05-25',41732),
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(10,'Floyd',NULL,'[email protected]','2022-06-06',58178);
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SELECT
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*
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FROM
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employees;
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-- Customers Table
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drop table if exists customers;
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CREATE TABLE customers (
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customer_id INT PRIMARY KEY,
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email VARCHAR(100) NOT NULL,
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first_name VARCHAR(20) NOT NULL,
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last_name VARCHAR(20),
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address VARCHAR(200) NOT NULL
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);
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insert into customers(customer_id,first_name,last_name,email,address)
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values (1,'Michael',NULL,'[email protected]','Downtown'),
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(2,'Trevor','Philips','[email protected]','Rockford Hills'),
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(3,'Franklin','Clinton','[email protected]','Vinewood'),
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(4,'Jimmy',NULL,'[email protected]','Rockford Hills'),
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(5,'Amanda',NULL,'[email protected]','Rockford Hills'),
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(6,'Floyd',NULL,'[email protected]','Vinewood'),
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(7,'Wade','Hebert','[email protected]','Vinewood'),
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(8,'Lester','Crest','[email protected]','Downtown'),
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(9,'Devin','Weston','[email protected]','Downtown'),
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(10,'Solomon','Richards','[email protected]','Downtown');
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SELECT
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*
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FROM
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customers;
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-- Products Table
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drop table if exists products;
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CREATE TABLE products (
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product_id INT PRIMARY KEY,
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product_name VARCHAR(100) NOT NULL,
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category VARCHAR(100) NOT NULL DEFAULT 'Others',
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price DECIMAL(10 , 2 ) NOT NULL CHECK (price > 0),
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product_desc VARCHAR(500) DEFAULT 'NA'
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);
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insert into products(product_id,product_name,category,price)
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values (1,'iPhone 14','Mobile',71999),
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(2,'iPhone 14 Plus','Mobile',80999),
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(3,'Pixel 7','Mobile',57099),
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(4,'Pixel 7 Pro','Mobile',81199),
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(5,'Nothing Phone (1)','Mobile',35999),
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(6,'HP Pavilion','Gaming Laptop',62990),
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(7,'HP OMEN','Gaming Laptop',160990),
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(8,'Asus ROG','Gaming Laptop',90990),
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(9,'iPad','Tablet',29990),
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(10,'iPad Air','Tablet',53990);
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-- Orders Table
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drop table if exists orders;
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CREATE TABLE orders (
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order_id INT PRIMARY KEY,
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order_date DATE NOT NULL,
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fk_customer_id INT,
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total_amount DECIMAL(10 , 2 ) NOT NULL CHECK (total_amount > 0),
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status VARCHAR(20) DEFAULT 'Placed',
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FOREIGN KEY (fk_customer_id)
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REFERENCES customers (customer_id)
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);
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insert into orders(order_id,order_date,fk_customer_id,total_amount,status)
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values(1,'2023-01-12',10,80999,'Delivered'),
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(2,'2023-01-20',8,57099,'Placed'),
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(3,'2023-01-21',8,81199,'Placed'),
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(4,'2023-01-24',7,35999,'Delivered'),
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(5,'2023-01-24',2,62990,'Delivered'),
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(6,'2023-01-25',10,160990,'Pending'),
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(7,'2023-02-02',4,62990,'Placed');
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-- Order Items Table
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drop table if exists orders_items;
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CREATE TABLE order_items (
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fk_order_id INT,
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fk_product_id INT,
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FOREIGN KEY (fk_order_id)
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REFERENCES orders (order_id),
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FOREIGN KEY (fk_product_id)
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REFERENCES products (product_id)
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);
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insert into order_items(fk_order_id, fk_product_id)
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values (1,2),
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(2,3),
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(3,4),
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(4,5),
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(5,6),
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(5,3),
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(6,7),
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(7,6);

‎07_where_clause.sql

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use test_db;
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-- 1. Write a query to retrieve all the data from the "employees" table where the employee_id is equal to 5.
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select *
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from employees
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where employee_id = 5;
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-- 2. Write a query to retrieve the first and last names of all employees from the "employees" table who were hired in the year 2022.
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select *
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from employees
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where hire_date >= 2022-01-01;
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-- 3. Write a query to retrieve the first and last names of all employees from the "employees" table who have a salary greater than 50,000.
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select first_name, last_name
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from employees
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where salary > 50000;
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-- 4. Write a query to retrieve the product names and prices of all products from the "products" table that have a price greater than 45000.
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select product_name, price
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from products
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where price > 45000;
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-- 5. Write a query to retrieve the order dates and total amounts of all orders from the "orders" table that have a total amount greater than 50000.
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select order_date, total_amount
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from orders
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where total_amount > 50000;
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-- 6. Write a query to retrieve the first and last names of all customers from the "customers" table who live in Downtown.
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select first_name, last_name
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from customers
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where address = 'Downtown';
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-- 7. Write a query to retrieve the order dates and total amounts of all orders from the "orders" table that were placed in the month of January.
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select order_date, total_amount
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from orders
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where MONTH(order_date) = 1;
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-- 8. Write a query to retrieve the order dates and total amounts of all order from the "order" table that have a status of "Pending".
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select order_date, total_amount, status
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from orders
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where status = 'Pending';
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-- 9. Write a query to retrieve the product names and prices of all products from the "products" table that belong to the "Tablet" category and have a price less than 28000.
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select product_name, price
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from products
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where category = 'Tablet'
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and price < 28000;
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