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exercises completed #34

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67 changes: 67 additions & 0 deletions queries.sql
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DROP DATABASE IF EXISTS shop;
CREATE DATABASE IF NOT EXISTS shop;
USE shop;

SELECT 'CREATING DATABASE STRUCTURE' as 'INFO';

DROP TABLE IF EXISTS sellers,
Products,
Orders,
Order_Items,
Customers;


/*!50503 set default_storage_engine = InnoDB */;
/*!50503 select CONCAT('storage engine: ', @@default_storage_engine) as INFO */;



CREATE TABLE sellers (
ID INT PRIMARY KEY AUTO_INCREMENT,
Name VARCHAR(255) NOT NULL,
Email VARCHAR(255) NOT NULL,
PhoneNumber VARCHAR(20) NOT NULL,
Address VARCHAR(255) NOT NULL,
CreatedAt TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE Customers (
ID INT AUTO_INCREMENT PRIMARY KEY,
Name VARCHAR(255),
Email VARCHAR(255),
Phone_Number VARCHAR(255),
Address VARCHAR(255),
Created_At TIMESTAMP
);

CREATE TABLE Products (
ID INT PRIMARY KEY AUTO_INCREMENT,
Name VARCHAR(255) NOT NULL,
Description TEXT,
Price DECIMAL(10,2) NOT NULL,
Stock INT NOT NULL,
Created_At TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
Seller_ID INT NOT NULL,
FOREIGN KEY (Seller_ID) REFERENCES Sellers(ID)
);

CREATE TABLE Orders (
ID INT PRIMARY KEY,
Order_Number INT,
Order_Date DATE,
Customer_ID INT,
Total_Amount FLOAT,
FOREIGN KEY (Customer_ID) REFERENCES Customers(ID)
);

CREATE TABLE Order_Items (
ID INT PRIMARY KEY AUTO_INCREMENT,
Product_ID INT,
Order_ID INT,
Quantity INT,
Price DECIMAL(10,2),
FOREIGN KEY (Product_ID) REFERENCES Products(ID),
FOREIGN KEY (Order_ID) REFERENCES Orders(ID)
);

SHOW TABLES FROM shop;
240 changes: 240 additions & 0 deletions queries_second.sql
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-- Sample employee database
-- See changelog table for details
-- Copyright (C) 2007,2008, MySQL AB
--
-- Original data created by Fusheng Wang and Carlo Zaniolo
-- http://www.cs.aau.dk/TimeCenter/software.htm
-- http://www.cs.aau.dk/TimeCenter/Data/employeeTemporalDataSet.zip
--
-- Current schema by Giuseppe Maxia
-- Data conversion from XML to relational by Patrick Crews
--
-- This work is licensed under the
-- Creative Commons Attribution-Share Alike 3.0 Unported License.
-- To view a copy of this license, visit
-- http://creativecommons.org/licenses/by-sa/3.0/ or send a letter to
-- Creative Commons, 171 Second Street, Suite 300, San Francisco,
-- California, 94105, USA.
--
-- DISCLAIMER
-- To the best of our knowledge, this data is fabricated, and
-- it does not correspond to real people.
-- Any similarity to existing people is purely coincidental.
--

DROP DATABASE IF EXISTS employees;
CREATE DATABASE IF NOT EXISTS employees;
USE employees;

SELECT 'CREATING DATABASE STRUCTURE' as 'INFO';

DROP TABLE IF EXISTS dept_emp,
dept_manager,
titles,
salaries,
employees,
departments;

/*!50503 set default_storage_engine = InnoDB */;
/*!50503 select CONCAT('storage engine: ', @@default_storage_engine) as INFO */;

CREATE TABLE employees (
emp_no INT NOT NULL,
birth_date DATE NOT NULL,
first_name VARCHAR(14) NOT NULL,
last_name VARCHAR(16) NOT NULL,
gender ENUM ('M','F') NOT NULL,
hire_date DATE NOT NULL,
PRIMARY KEY (emp_no)
);

CREATE TABLE departments (
dept_no CHAR(4) NOT NULL,
dept_name VARCHAR(40) NOT NULL,
PRIMARY KEY (dept_no),
UNIQUE KEY (dept_name)
);

CREATE TABLE dept_manager (
emp_no INT NOT NULL,
dept_no CHAR(4) NOT NULL,
from_date DATE NOT NULL,
to_date DATE NOT NULL,
FOREIGN KEY (emp_no) REFERENCES employees (emp_no) ON DELETE CASCADE,
FOREIGN KEY (dept_no) REFERENCES departments (dept_no) ON DELETE CASCADE,
PRIMARY KEY (emp_no,dept_no)
);

CREATE TABLE dept_emp (
emp_no INT NOT NULL,
dept_no CHAR(4) NOT NULL,
from_date DATE NOT NULL,
to_date DATE NOT NULL,
FOREIGN KEY (emp_no) REFERENCES employees (emp_no) ON DELETE CASCADE,
FOREIGN KEY (dept_no) REFERENCES departments (dept_no) ON DELETE CASCADE,
PRIMARY KEY (emp_no,dept_no)
);

CREATE TABLE titles (
emp_no INT NOT NULL,
title VARCHAR(50) NOT NULL,
from_date DATE NOT NULL,
to_date DATE,
FOREIGN KEY (emp_no) REFERENCES employees (emp_no) ON DELETE CASCADE,
PRIMARY KEY (emp_no,title, from_date)
)
;

CREATE TABLE salaries (
emp_no INT NOT NULL,
salary INT NOT NULL,
from_date DATE NOT NULL,
to_date DATE NOT NULL,
FOREIGN KEY (emp_no) REFERENCES employees (emp_no) ON DELETE CASCADE,
PRIMARY KEY (emp_no, from_date)
)
;

CREATE OR REPLACE VIEW dept_emp_latest_date AS
SELECT emp_no, MAX(from_date) AS from_date, MAX(to_date) AS to_date
FROM dept_emp
GROUP BY emp_no;

# shows only the current department for each employee
CREATE OR REPLACE VIEW current_dept_emp AS
SELECT l.emp_no, dept_no, l.from_date, l.to_date
FROM dept_emp d
INNER JOIN dept_emp_latest_date l
ON d.emp_no=l.emp_no AND d.from_date=l.from_date AND l.to_date = d.to_date;

INSERT INTO employees (emp_no, birth_date, first_name, last_name, gender, hire_date)
VALUES (1, '1995-01-01', 'John', 'Doe', 'M', '2020-01-01'),
(2, '1995-02-01', 'Jane', 'Doe', 'F', '2020-02-01'),
(3, '1995-03-01', 'John', 'Smith', 'M', '2020-03-01'),
(4, '1995-04-01', 'Jane', 'Smith', 'F', '2020-04-01'),
(5, '1995-05-01', 'John', 'Johnson', 'M', '2020-05-01'),
(6, '1995-06-01', 'Jane', 'Johnson', 'F', '2020-06-01'),
(7, '1995-07-01', 'John', 'Williams', 'M', '2020-07-01'),
(8, '1995-08-01', 'Jane', 'Williams', 'F', '2020-08-01'),
(9, '1995-09-01', 'John', 'Jones', 'M', '2020-09-01'),
(10, '1995-10-01', 'Jane', 'Jones', 'F', '2020-10-01'),
(11, '1995-11-01', 'John', 'Brown', 'M', '2020-11-01'),
(12, '1995-12-01', 'Jane', 'Brown', 'F', '2020-12-01'),
(13, '1995-12-01', 'John', 'Miller', 'M', '2020-12-01'),
(14, '1995-12-01', 'Jane', 'Miller', 'F', '2020-12-01'),
(15, '1995-12-01', 'John', 'Moore', 'M', '2020-12-01');

INSERT INTO dept_emp (emp_no, dept_no, from_date, to_date)
VALUES (4, 'd002', '2022-04-02', '2024-04-01'),
(5, 'd001', '2020-05-01', '2022-05-01'),
(5, 'd002', '2022-05-02', '2024-05-01'),
(6, 'd001', '2020-06-01', '2022-06-01'),
(6, 'd002', '2022-06-02', '2024-06-01'),
(7, 'd001', '2020-07-01', '2022-07-01'),
(7, 'd002', '2022-07-02', '2024-07-01'),
(8, 'd001', '2020-08-01', '2022-08-01'),
(8, 'd002', '2022-08-02', '2024-08-01'),
(9, 'd001', '2020-09-01', '2022-09-01'),
(9, 'd002', '2022-09-02', '2024-09-01'),
(10, 'd001', '2020-10-01', '2022-10-01'),
(10, 'd002', '2022-10-02', '2024-10-01');

INSERT INTO dept_manager (emp_no, dept_no, from_date, to_date)
VALUES (1, 'd001', '2020-01-01', '2022-01-01'),
(2, 'd002', '2020-02-01', '2022-02-01'),
(3, 'd003', '2020-03-01', '2022-03-01'),
(4, 'd004', '2020-04-01', '2022-04-01'),
(5, 'd001', '2020-05-01', '2022-05-01');

INSERT INTO titles (emp_no, title, from_date, to_date)
VALUES (5, 'Engineer', '2022-05-02', '2024-05-01'),
(6, 'Manager', '2020-06-01', '2022-06-01'),
(6, 'Engineer', '2022-06-02', '2024-06-01'),
(7, 'Manager', '2020-07-01', '2022-07-01'),
(7, 'Engineer', '2022-07-02', '2024-07-01'),
(8, 'Manager', '2020-08-01', '2022-08-01'),
(8, 'Engineer', '2022-08-02', '2024-08-01'),
(9, 'Manager', '2020-09-01', '2022-09-01'),
(9, 'Engineer', '2022-09-02', '2024-09-01'),
(10, 'Manager', '2020-10-01', '2022-10-01'),
(10, 'Engineer', '2022-10-02', '2024-10-01');

INSERT INTO salaries (emp_no, salary, from_date, to_date)
VALUES (1, 10000, '2020-01-01', '2022-01-01'),
(2, 15000, '2022-01-02', '2024-01-01'),
(3, 20000, '2020-02-01', '2022-02-01'),
(4, 25000, '2022-02-02', '2024-02-01'),
(5, 30000, '2020-03-01', '2022-03-01'),
(6, 35000, '2022-03-02', '2024-03-01'),
(7, 40000, '2020-04-01', '2022-04-01'),
(8, 45000, '2022-04-02', '2024-04-01'),
(9, 5000, '2020-05-01', '2022-05-01'),
(10, 5000, '2022-05-02', '2024-05-01'),
(11, 3000, '2022-03-01', '2024-06-01'),
(12, 1500, '2020-05-01', '2024-06-03'),
(13, 3600, '2020-03-03', '2024-07-06'),
(14, 2200, '2020-12-02', '2024-07-18'),
(15, 1300, '2020-02-05', '2024-08-05');

UPDATE employees
SET first_name = 'Albert', last_name = 'Jhonson'
WHERE first_name = 'John' AND last_name = 'Doe' AND birth_date = '1995-01-01';

UPDATE departments
SET dept_name = 'Development'
WHERE dept_no = 'd002';

SELECT employees.*, salaries.salary
FROM employees
INNER JOIN salaries
ON employees.emp_no = salaries.emp_no
WHERE salaries.salary > 20000;

SELECT employees.*, salaries.salary
FROM employees
JOIN salaries ON employees.emp_no = salaries.emp_no
WHERE salaries.salary < 10000;

SELECT employees.*, salaries.salary
FROM employees
JOIN salaries ON employees.emp_no = salaries.emp_no
WHERE salaries.salary BETWEEN 14000 AND 50000;

SELECT COUNT(*) as 'Total Employees' FROM employees;

SELECT COUNT(DISTINCT dept_emp.emp_no) as 'Total Employees' FROM dept_emp
GROUP BY emp_no
HAVING COUNT(*) > 1;

SELECT title
FROM titles
WHERE YEAR(from_date) = 2020;

SELECT first_name FROM employees WHERE first_name REGEXP '[[:upper:]]';

SELECT e.first_name, e.last_name, d.dept_name
FROM employees e
JOIN current_dept_emp cde ON e.emp_no = cde.emp_no
JOIN departments d ON cde.dept_no = d.dept_no;

SELECT first_name, last_name, COUNT(title) AS 'Number of Manager Positions'
FROM employees
JOIN titles ON employees.emp_no = titles.emp_no
WHERE title = 'Manager'
GROUP BY first_name, last_name
ORDER BY COUNT(title) DESC;

SELECT DISTINCT first_name FROM employees;

DELETE FROM employees
WHERE emp_no IN (SELECT emp_no FROM salaries WHERE salary > 20000);


DELETE FROM departments WHERE dept_no = (
SELECT dept_no
FROM dept_emp
JOIN employees ON dept_emp.emp_no = employees.emp_no
GROUP BY dept_no
ORDER BY COUNT(dept_emp.emp_no) DESC
LIMIT 1
);