Skip to content

Solution: Mònica Reverté #41

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 3 commits into
base: master
Choose a base branch
from
Open

Solution: Mònica Reverté #41

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
813860f
First part
monica-reverte Jan 23, 2023
c65b85b
my database
monica-reverte Jan 23, 2023
832ef6c
reedme and diagram
monica-reverte Jan 23, 2023
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
Binary file added Diagram.jpg
View file
Open in desktop
Loading
Sorry, something went wrong. Reload?
Sorry, we cannot display this file.
Sorry, this file is invalid so it cannot be displayed.
7 changes: 6 additions & 1 deletion README.md
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
# 💊 MySQL Basics
# MySQL Basics

_MySQL, SQL language, setting environment variables._

Expand All @@ -13,3 +13,8 @@ This repository contains only the following files:
- **_README.md_**: this explanatory file.
- **_employees.sql_**: file containing an example database provided by the official MySQL team, to import and use in our exercise.
- **_queries.sql_**: file where we recorded all the necessary queries executed to fulfill this exercise.
- **_Diagram.jpg_**: database diagram.

### DataBase diagram

DataBase diagram in this repository
108 changes: 108 additions & 0 deletions employees.sql
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,108 @@
-- 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;
229 changes: 229 additions & 0 deletions queries.sql
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,229 @@

-- Insert Data

INSERT INTO employees (emp_no, birth_date, first_name, last_name, gender, hire_date) VALUES ('1', '1980-01-1', 'David', 'Sanchez', 'M', '2020-12-21');
INSERT INTO employees (emp_no, birth_date, first_name, last_name, gender, hire_date) VALUES ('2', '1981-02-2', 'David', 'Gomez', 'M', '2022-11-21');
INSERT INTO employees (emp_no, birth_date, first_name, last_name, gender, hire_date) VALUES ('3', '1982-03-3', 'David', 'Martinez', 'M', '2019-10-10');
INSERT INTO employees (emp_no, birth_date, first_name, last_name, gender, hire_date) VALUES ('4', '1983-04-4', 'Jana', 'Rovira', 'F', '2018-09-22');
INSERT INTO employees (emp_no, birth_date, first_name, last_name, gender, hire_date) VALUES ('5', '1984-05-5', 'Nil', 'Masana', 'M', '2020-08-04');
INSERT INTO employees (emp_no, birth_date, first_name, last_name, gender, hire_date) VALUES ('6', '1985-06-6', 'Abril', 'Reverté', 'F', '2022-07-03');
INSERT INTO employees (emp_no, birth_date, first_name, last_name, gender, hire_date) VALUES ('7', '1986-07-7', 'Aleix', 'Romero', 'M', '2019-12-20');
INSERT INTO employees (emp_no, birth_date, first_name, last_name, gender, hire_date) VALUES ('8', '1987-08-8', 'Eloi', 'Vicente', 'M', '2018-11-14');
INSERT INTO employees (emp_no, birth_date, first_name, last_name, gender, hire_date) VALUES ('9', '1988-09-9', 'Carla', 'Casabayó', 'F', '2017-10-24');
INSERT INTO employees (emp_no, birth_date, first_name, last_name, gender, hire_date) VALUES ('10', '1989-10-10', 'Asia', 'Madorell', 'F', '2021-08-07');
INSERT INTO employees (emp_no, birth_date, first_name, last_name, gender, hire_date) VALUES ('11', '1990-11-11', 'Monica', 'Riatós', 'F', '2021-06-05');
INSERT INTO employees (emp_no, birth_date, first_name, last_name, gender, hire_date) VALUES ('12', '1981-12-12', 'Sergi', 'Mosquera', 'M', '2022-04-01');
INSERT INTO employees (emp_no, birth_date, first_name, last_name, gender, hire_date) VALUES ('13', '1992-01-13', 'Siena', 'Manuel', 'F', '2022-02-12');
INSERT INTO employees (emp_no, birth_date, first_name, last_name, gender, hire_date) VALUES ('14', '1993-02-14', 'Cris', 'Moreno', 'F', '2019-01-17');
INSERT INTO employees (emp_no, birth_date, first_name, last_name, gender, hire_date) VALUES ('15', '1994-03-15', 'Marti', 'Palomas', 'M', '2018-07-21');

-- Salaries

INSERT INTO `salaries` (`emp_no`, `salary`, `from_date`, `to_date`) VALUES ('1', '5000', '2020-12-21', '2021-12-21');
INSERT INTO `salaries` (`emp_no`, `salary`, `from_date`, `to_date`) VALUES ('2', '10000', '2022-11-21', '2023-01-20');
INSERT INTO `salaries` (`emp_no`, `salary`, `from_date`, `to_date`) VALUES ('3', '12000', '2019-10-10', '2023-01-20');
INSERT INTO `salaries` (`emp_no`, `salary`, `from_date`, `to_date`) VALUES ('4', '5000', '2018-09-22', '2020-09-22');
INSERT INTO `salaries` (`emp_no`, `salary`, `from_date`, `to_date`) VALUES ('5', '5000', '2020-08-04', '2021-08-04');
INSERT INTO `salaries` (`emp_no`, `salary`, `from_date`, `to_date`) VALUES ('6', '5000', '2022-07-03', '2022-12-03');
INSERT INTO `salaries` (`emp_no`, `salary`, `from_date`, `to_date`) VALUES ('7', '5000', '2019-12-20', '2020-12-20');
INSERT INTO `salaries` (`emp_no`, `salary`, `from_date`, `to_date`) VALUES ('8', '10000', '2018-11-14', '2023-01-20');
INSERT INTO `salaries` (`emp_no`, `salary`, `from_date`, `to_date`) VALUES ('9', '10000', '2017-10-24', '2023-01-20');
INSERT INTO `salaries` (`emp_no`, `salary`, `from_date`, `to_date`) VALUES ('10', '15000', '2021-08-07', '2023-01-20');
INSERT INTO `salaries` (`emp_no`, `salary`, `from_date`, `to_date`) VALUES ('11', '15000', '2021-06-05', '2023-01-20');
INSERT INTO `salaries` (`emp_no`, `salary`, `from_date`, `to_date`) VALUES ('12', '10000', '2022-04-01', '2023-01-20');
INSERT INTO `salaries` (`emp_no`, `salary`, `from_date`, `to_date`) VALUES ('13', '15000', '2022-02-12', '2023-01-20');
INSERT INTO `salaries` (`emp_no`, `salary`, `from_date`, `to_date`) VALUES ('14', '12000', '2019-01-17', '2023-01-20');
INSERT INTO `salaries` (`emp_no`, `salary`, `from_date`, `to_date`) VALUES ('15', '7000', '2018-07-21', '2023-01-20');

-- Two Salaries

INSERT INTO `salaries` (`emp_no`, `salary`, `from_date`, `to_date`) VALUES ('1', '10000', '2021-12-21', '2023-01-20');
INSERT INTO `salaries` (`emp_no`, `salary`, `from_date`, `to_date`) VALUES ('4', '10000', '2020-09-22', '2023-01-20');
INSERT INTO `salaries` (`emp_no`, `salary`, `from_date`, `to_date`) VALUES ('5', '10000', '2021-08-04', '2023-01-20');
INSERT INTO `salaries` (`emp_no`, `salary`, `from_date`, `to_date`) VALUES ('6', '10000', '2022-12-03', '2023-01-20');
INSERT INTO `salaries` (`emp_no`, `salary`, `from_date`, `to_date`) VALUES ('7', '10000', '2020-12-20', '2023-01-20');

-- Department

INSERT INTO `departments` (`dept_no`, `dept_name`) VALUES ('1', 'Comercial');
INSERT INTO `departments` (`dept_no`, `dept_name`) VALUES ('2', 'Admin');
INSERT INTO `departments` (`dept_no`, `dept_name`) VALUES ('3', 'Manager');
INSERT INTO `departments` (`dept_no`, `dept_name`) VALUES ('4', 'Jefatura');

-- Departaments Employee

INSERT INTO `dept_emp` (`emp_no`, `dept_no`, `from_date`, `to_date`) VALUES ('1', '1', '2020-12-21', '2023-01-20'), ('1', '4', '2020-12-21', '2023-01-20');
INSERT INTO `dept_emp` (`emp_no`, `dept_no`, `from_date`, `to_date`) VALUES ('2', '2', '2022-11-21', '2023-01-20'), ('2', '4', '2022-11-21', '2023-01-20');
INSERT INTO `dept_emp` (`emp_no`, `dept_no`, `from_date`, `to_date`) VALUES ('3', '3', '2019-10-10', '2023-01-20'), ('3', '4', '2019-10-10', '2023-01-20');
INSERT INTO `dept_emp` (`emp_no`, `dept_no`, `from_date`, `to_date`) VALUES ('4', '1', '2018-09-22', '2023-01-20'), ('4', '4', '2018-09-22', '2023-01-20');
INSERT INTO `dept_emp` (`emp_no`, `dept_no`, `from_date`, `to_date`) VALUES ('5', '2', '2020-08-04', '2023-01-20'), ('5', '4', '2020-08-04', '2023-01-20');
INSERT INTO `dept_emp` (`emp_no`, `dept_no`, `from_date`, `to_date`) VALUES ('6', '3', '2022-07-03', '2023-01-20'), ('6', '1', '2022-07-03', '2023-01-20');
INSERT INTO `dept_emp` (`emp_no`, `dept_no`, `from_date`, `to_date`) VALUES ('7', '3', '2019-12-20', '2023-01-20'), ('7', '1', '2019-12-20', '2023-01-20');
INSERT INTO `dept_emp` (`emp_no`, `dept_no`, `from_date`, `to_date`) VALUES ('8', '1', '2018-11-14', '2023-01-20'), ('8', '2', '2018-11-14', '2023-01-20');
INSERT INTO `dept_emp` (`emp_no`, `dept_no`, `from_date`, `to_date`) VALUES ('9', '1', '2017-10-24', '2023-01-20'), ('9', '2', '2017-10-24', '2023-01-20');
INSERT INTO `dept_emp` (`emp_no`, `dept_no`, `from_date`, `to_date`) VALUES ('10', '1', '2021-08-07', '2023-01-20'), ('10', '2', '2021-08-07', '2023-01-20');
INSERT INTO `dept_emp` (`emp_no`, `dept_no`, `from_date`, `to_date`) VALUES ('11', '3', '2021-06-05', '2023-01-20');
INSERT INTO `dept_emp` (`emp_no`, `dept_no`, `from_date`, `to_date`) VALUES ('12', '3', '2022-04-01', '2023-01-20');
INSERT INTO `dept_emp` (`emp_no`, `dept_no`, `from_date`, `to_date`) VALUES ('13', '3', '2022-02-12', '2023-01-20');
INSERT INTO `dept_emp` (`emp_no`, `dept_no`, `from_date`, `to_date`) VALUES ('14', '3', '2019-01-17', '2023-01-20');
INSERT INTO `dept_emp` (`emp_no`, `dept_no`, `from_date`, `to_date`) VALUES ('15', '1', '2018-07-21', '2023-01-20');

--Managers

INSERT INTO `dept_manager` (`emp_no`, `dept_no`, `from_date`, `to_date`) VALUES ('6', '3', '2022-07-03', '2023-01-20');
INSERT INTO `dept_manager` (`emp_no`, `dept_no`, `from_date`, `to_date`) VALUES ('11', '3', '2021-06-05', '2023-01-20');
INSERT INTO `dept_manager` (`emp_no`, `dept_no`, `from_date`, `to_date`) VALUES ('7', '3', '2019-12-20', '2023-01-20');
INSERT INTO `dept_manager` (`emp_no`, `dept_no`, `from_date`, `to_date`) VALUES ('5', '4', '2020-08-04', '2023-01-20');
INSERT INTO `dept_manager` (`emp_no`, `dept_no`, `from_date`, `to_date`) VALUES ('9', '2', '2017-10-24', '2023-01-20');

--Title

INSERT INTO `titles` (`emp_no`, `title`, `from_date`, `to_date`) VALUES ('1', 'Comunicació Audiovisual', '2016-12-21', '2020-12-21');
INSERT INTO `titles` (`emp_no`, `title`, `from_date`, `to_date`) VALUES ('2', 'Comunicació Audiovisual', '2018-11-21', '2022-11-21');
INSERT INTO `titles` (`emp_no`, `title`, `from_date`, `to_date`) VALUES ('3', 'Comunicació Audiovisual', '2015-10-10', '2019-10-10');
INSERT INTO `titles` (`emp_no`, `title`, `from_date`, `to_date`) VALUES ('4', 'Comunicació Audiovisual', '2012-09-22', '2018-09-22');
INSERT INTO `titles` (`emp_no`, `title`, `from_date`, `to_date`) VALUES ('5', 'Comunicació Audiovisual', '2016-08-04', '2020-08-04');
INSERT INTO `titles` (`emp_no`, `title`, `from_date`, `to_date`) VALUES ('6', 'Comunicació Audiovisual', '2018-07-03', '2022-07-03');
INSERT INTO `titles` (`emp_no`, `title`, `from_date`, `to_date`) VALUES ('7', 'Comunicació Audiovisual', '2015-12-20', '2019-12-20');
INSERT INTO `titles` (`emp_no`, `title`, `from_date`, `to_date`) VALUES ('8', 'Comunicació Audiovisual', '2014-06-01', '2018-11-14');
INSERT INTO `titles` (`emp_no`, `title`, `from_date`, `to_date`) VALUES ('9', 'Comunicació Audiovisual', '2013-11-14', '2017-10-24');
INSERT INTO `titles` (`emp_no`, `title`, `from_date`, `to_date`) VALUES ('10', 'Comunicació Audiovisual', '2017-08-07', '2021-08-07');
INSERT INTO `titles` (`emp_no`, `title`, `from_date`, `to_date`) VALUES ('11', 'Comunicació Audiovisual', '2020-06-01', '2023-01-20');
INSERT INTO `titles` (`emp_no`, `title`, `from_date`, `to_date`) VALUES ('12', 'Comunicació Audiovisual', '2020-06-01', '2023-01-20');
INSERT INTO `titles` (`emp_no`, `title`, `from_date`, `to_date`) VALUES ('13', 'Comunicació Audiovisual', '2020-06-01', '2023-01-20');
INSERT INTO `titles` (`emp_no`, `title`, `from_date`, `to_date`) VALUES ('14', 'Comunicació Audiovisual', '2020-06-01', '2023-01-20');
INSERT INTO `titles` (`emp_no`, `title`, `from_date`, `to_date`) VALUES ('15', 'Comunicació Audiovisual', '2020-06-01', '2023-01-20');


--Update change a name

UPDATE employees SET first_name = 'Joan' WHERE emp_no = 1;

UPDATE employees SET first_name = 'Aran', last_name = 'Sil', birth_date = '2022-11-22' WHERE emp_no = 2;

--Update department

UPDATE departments SET dept_name = 'Limpieza' WHERE dept_no = 1;
UPDATE departments SET dept_name = 'Recepcion' WHERE dept_no = 2;
UPDATE departments SET dept_name = 'Oficinas' WHERE dept_no = 3;
UPDATE departments SET dept_name = 'Control' WHERE dept_no = 4;

--Get data

-- more than 20000

SELECT salary > 20000, from_date FROM salaries;

-- less than 10000

SELECT salary < 10000, from_date FROM salaries;

-- Between 14000 and 50000

SELECT salary, from_date FROM salaries WHERE (salary > 14000) OR (salary < 50000);

-- Number of employees

SELECT emp_no FROM employees;

-- Empoyees more than one department

SELECT emp_no, dept_no FROM dept_emp WHERE dept_no = 1 AND 2;

-- Titles from 2020

SELECT * FROM titles WHERE from_date LIKE '2020%';

-- Capital Letters

SELECT UCASE (first_name) FROM employees;


-- Employees department

SELECT employees.first_name, employees.last_name, dept_emp.dept_no FROM employees LEFT JOIN dept_emp ON employees.emp_no = dept_emp.emp_no;

-- Manager employees

SELECT employees.first_name, employees.last_name, dept_manager.dept_no FROM employees LEFT JOIN dept_manager ON employees.emp_no = dept_manager.emp_no;

-- Select the name of employees without any being repeated

SELECT DISTINCT first_name from employees;


--Delete data

DELETE FROM salaries WHERE salary > 20000;

-- Delete more employees

DELETE FROM departments WHERE dept_no = (SELECT dept_no FROM dept_emp WHERE to_date >= CURDATE() GROUP BY dept_no ORDER BY COUNT(DISTINCT emp_no) DESC LIMIT 1);

-- OWN DATABASE

DROP DATABASE IF EXISTS shopping;
CREATE DATABASE IF NOT EXISTS shopping;
USE shopping;
DROP TABLE IF EXISTS line_items,
customers,
stock,
products,
invoice;

CREATE TABLE line_items (
invoice_id INT AUTO_INCREMENT NOT NULL,
product_id INT(20) NOT NULL,
unit price INT(50) NOT NULL,
units INT(20) NOT NULL,
product_name VARCHAR(50) NOT NULL,
total INT(20) NOT NULL,
PRIMARY KEY (invoice_id);
);

CREATE TABLE stock (
category_id INT AUTO_INCREMENT NOT NULL,
category_name VARCHAR(60) NOT NULL,
total_stock INT(30) NOT NULL,
discount INT(10) NOT NULL,
PRIMARY KEY (category_id)
);

CREATE TABLE products (
product_id INT AUTO_INCREMENT NOT NULL,
product_name VARCHAR(50) NOT NULL,
Unit price INT (20) NOT NULL,
Stock INT (20) NOT NULL,
category_id INT (20) NOT NULL,
FOREIGN KEY (category_id) REFERENCES stock (category_id) ON DELETE CASCADE,
PRIMARY KEY (product_id)
);

CREATE TABLE invoices (
customer_id INT (20) NOT NULL,
invoice_id INT (20) NOT NULL,
ordered_date DATE NOT NULL,
subtotal INT (20) NOT NULL,
discount INT (20) NOT NULL,
FOREIGN KEY (invoice_id) REFERENCES line_items (invoice_id) ON DELETE CASCADE,
PRIMARY KEY (id)
);

CREATE TABLE customers (
customers_id INT AUTO_INCREMENT NOT NULL,
customers_name VARCHAR(50) NOT NULL,
address_name VARCHAR(50) NOT NULL,
country VARCHAR(50) NOT NULL,
phone INT(12) NOT NULL,
region VARCHAR(50) NOT NULL,
PRIMARY KEY (customers_id)
);