diff --git a/diagramaDatabase.png b/diagramaDatabase.png new file mode 100644 index 0000000..0702ab1 Binary files /dev/null and b/diagramaDatabase.png differ diff --git a/employees.sql b/employees.sql new file mode 100644 index 0000000..345964d --- /dev/null +++ b/employees.sql @@ -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; \ No newline at end of file diff --git a/queries.sql b/queries.sql new file mode 100644 index 0000000..b078147 --- /dev/null +++ b/queries.sql @@ -0,0 +1,267 @@ +-- INSERT DATA + +-- At least 15 employees (at least 3 with same name) + +INSERT INTO employees VALUES + (1, "1990-12-03", "Laia", "Estruch", "F", "2015-07-14"), + (2, "1985-08-20", "Guillem", "Sala", "M", "2015-07-14"), + (3, "1980-03-23", "Laura", "Romià", "F", "2016-04-20"), + (4, "1989-04-10", "Aleix", "Pons", "M", "2016-07-30"), + (5, "1970-02-21", "Paula", "Gual", "F", "2017-01-24"), + (6, "1973-03-30", "Laia", "Mas", "F", "2018-01-15"), + (7, "1984-09-29", "Xavi", "Ros", "M", "2018-03-12"), + (8, "1985-11-21", "Blai", "Vives", "M", "2018-07-15"), + (9, "1983-12-12", "Laia", "Llach", "F", "2019-01-24"), + (10, "1989-08-19", "Joan", "Soler", "M", "2020-05-05"), + (11, "1985-07-25", "Ares", "Nadal", "F", "2020-05-05"), + (12, "1990-06-28", "Arnau", "Roig", "M", "2021-07-02"), + (13, "1994-07-12", "Rita", "Pitarch", "F", "2021-08-30"), + (14, "1995-10-21", "Xavi", "Vidal", "M", "2021-09-20"), + (15, "1984-12-11", "Marta", "Grau", "F", "2022-07-24"); + +-- Salaries between 5000 and 50000 of different gender +-- 5 employees must have at least two salaries in different ranges of dates and different amounts + +INSERT INTO salaries VALUES + (1, 15000, "2015-07-14", "2016-07-14"), + (1, 45000, "2016-07-14", "2019-07-14"), + (1, 37000, "2019-07-14", "2022-12-31"), + (2, 25000, "2015-07-14", "2017-07-14"), + (2, 35000, "2017-07-14", "2019-08-30"), + (2, 35000, "2019-08-31", "2022-12-31"), + (3, 45000, "2016-04-20", "2020-12-31"), + (3, 50000, "2021-01-01", "2022-12-31"), + (4, 37000, "2016-07-30", "2020-12-31"), + (4, 39000, "2021-01-01", "2022-12-31"), + (5, 37000, "2017-01-24", "2020-12-31"), + (5, 39000, "2021-01-01", "2022-12-31"), + (6, 26000, "2018-01-15", "2020-12-31"), + (6, 32000, "2021-01-01", "2022-12-31"), + (7, 27000, "2018-03-12", "2020-12-31"), + (7, 29000, "2021-01-01", "2022-12-31"), + (8, 50000, "2018-07-15", "2022-12-31"), + (9, 42000, "2019-01-24", "2022-12-31"), + (10, 36000, "2020-05-05", "2022-12-31"), + (11, 36000, "2020-05-05", "2022-12-31"), + (12, 24000, "2021-07-02", "2022-12-31"), + (13, 22000, "2021-08-30", "2022-12-31"), + (14, 19000, "2021-09-20", "2022-12-31"), + (15, 8000, "2022-07-24", "2022-12-31"); + +-- 10 employees belong to more than one department + +INSERT INTO departments VALUES + ("FNNC", "Finance"), + ("CCNT", "Accounting"), + ("MRKT", "Marketing"), + ("RSRC", "Research"), + ("DVLP", "Development"), + ("HMNR", "Human Resources"), + ("PRDC", "Production"); + +INSERT INTO dept_emp VALUES + (5, "HMNR", "2017-01-24", "2023-01-20"), + (5, "FNNC", "2017-01-24", "2023-01-20"), + (7, "FNNC", "2018-03-12", "2023-01-20"), + (7, "CCNT", "2018-03-12", "2023-01-20"), + (8, "PRDC", "2018-07-15", "2023-01-20"), + (9, "PRDC", "2019-01-24", "2023-01-20"), + (9, "MRKT", "2019-01-24", "2023-01-20"), + (10, "HMNR", "2020-05-05", "2023-01-20"), + (10, "MRKT", "2022-05-01", "2023-01-20"), + (11, "DVLP", "2020-05-05", "2023-01-20"), + (11, "RSRC", "2021-01-01", "2023-01-20"), + (12, "PRDC", "2021-07-02", "2023-01-20"), + (12, "RSRC", "2022-01-01", "2023-01-20"), + (13, "PRDC", "2021-08-30", "2023-01-20"), + (14, "PRDC", "2021-09-20", "2023-01-20"), + (15, "CCNT", "2022-07-24", "2023-01-20"), + (15, "PRDC", "2022-07-24", "2023-01-20"); + +-- 5 employees are managers + +INSERT INTO dept_manager VALUES + (1, "FNNC", "2020-01-01", "2023-01-20"), + (1, "CCNT", "2020-01-01", "2023-01-20"), + (3, "MRKT", "2018-05-15", "2023-01-20"), + (2, "RSRC", "2018-12-14", "2023-01-20"), + (2, "DVLP", "2018-12-14", "2023-01-20"), + (4, "HMNR", "2018-07-30", "2023-01-20"), + (6, "PRDC", "2019-03-24", "2023-01-20"); + +-- All employees have a degree and at least 5 titles are from 2020 + +INSERT INTO titles VALUES + (1, "Finance and Accounting Degree", "2010-02-15", "2015-02-15"), + (2, "Research and Development Degree", "2010-09-15", "2015-06-15"), + (3, "Marketing Degree", "2010-09-15", "2015-06-15"), + (4, "Human Resources Degree", "2011-02-15", "2016-02-15"), + (5, "Finance and Accounting Degree", "2011-09-15", "2016-06-15"), + (6, "Production Degree", "2012-09-15", "2017-06-15"), + (7, "Finance and Accounting Degree", "2012-09-15", "2017-06-15"), + (8, "Production Degree", "2013-09-15", "2018-06-15"), + (9, "Marketing Degree", "2013-02-15", "2018-02-15"), + (10, "Human Resources Degree", "2015-02-15", "2020-02-15"), + (11, "Research and Development Degree", "2015-02-15", "2020-02-15"), + (12, "Production Degree", "2015-09-15", "2020-06-15"), + (13, "Production Degree", "2015-09-15", "2020-06-15"), + (14, "Production Degree", "2015-09-15", "2020-06-15"), + (15, "Accounting Degree", "2015-09-15", "2020-06-15"); + +-- UPDATE DATA + +-- UPDATE EMPLOYEES _ Change name of an employee (query based on name, surname and date of birth) + +UPDATE employees + SET first_name = "Lara" + WHERE first_name = "Laura" AND last_name = "Romi?" AND birth_date = "1980-03-23"; + +-- UPDATE DEPARTMENTS _ Change the name of all departments + +UPDATE departments SET dept_name = CONCAT(dept_name, " Dpt"); + +-- GET DATA +-- Select all employees with a salary greater than 20,000, you must list all employees data and the salary. + +SELECT employees.*, salaries.salary FROM employees + LEFT JOIN salaries ON employees.emp_no = salaries.emp_no + WHERE salaries.salary > 20000; + +-- Select all employees with a salary below 10,000, you must list all employees data and the salary. + +SELECT employees.*, salaries.salary FROM employees + LEFT JOIN salaries ON employees.emp_no = salaries.emp_no + WHERE salaries.salary < 10000; + +-- Select all employees who have a salary between 14,000 and 50,000, you must list all employees data and the salary. + +SELECT employees.*, salaries.salary FROM employees + LEFT JOIN salaries ON employees.emp_no = salaries.emp_no + WHERE salaries.salary > 14000 AND salaries.salary < 50000; + +-- Select the total number of employees + +SELECT COUNT(emp_no) FROM employees; + +-- Select the total number of employees who have worked in more than one department + +SELECT COUNT(*) FROM + ( SELECT emp_no, COUNT(*) AS CNT + FROM dept_emp + GROUP BY emp_no + ) AS T + WHERE CNT > 1; + +-- Select the titles of the year 2020 + +SELECT title FROM titles WHERE to_date LIKE "2020%"; + +-- Select the name of all employees with capital letters + +SELECT UPPER(first_name) FROM employees; + +-- Select the name, surname and name of the current department of each employee + +SELECT T.first_name, T.last_name, departments.dept_name FROM + (SELECT first_name, last_name, dept_no FROM employees + INNER JOIN dept_emp ON employees.emp_no = dept_emp.emp_no) AS T + INNER JOIN departments ON T.dept_no = departments.dept_no; + +-- Select the name, surname and number of times the employee has worked as a manager + +SELECT first_name, last_name, COUNT(*) AS CNT FROM employees + INNER JOIN dept_manager ON employees.emp_no = dept_manager.emp_no + GROUP BY employees.emp_no; + +-- Select the name of employees without any being repeated + +SELECT DISTINCT first_name FROM employees; + +-- DELETE DATA + +-- Delete all employees with a salary greater than 20,000 + +DELETE employees FROM employees + INNER JOIN salaries ON employees.emp_no = salaries.emp_no + WHERE salaries.salary > 20000; + +-- Remove the department that has more employees. + +DELETE FROM departments + WHERE dept_no = (SELECT dept_no FROM dept_emp GROUP BY dept_no ORDER BY COUNT(dept_no) DESC LIMIT 1); + +-- Case more than one department to delete. + +DELETE FROM departments + WHERE dept_no IN (SELECT T.dept_no FROM + (SELECT dept_no, COUNT(dept_no) AS num_limit FROM dept_emp + GROUP BY dept_no) AS T + WHERE T.num_limit = (SELECT COUNT(dept_no) AS num_limit FROM dept_emp + GROUP BY dept_no ORDER BY num_limit DESC LIMIT 1)); + + +-- DESIGN AND CREATE A DATABASE + +DROP DATABASE IF EXISTS gym; +CREATE DATABASE IF NOT EXISTS gym; +USE gym; + +SELECT 'CREATING DATABASE STRUCTURE' as 'INFO'; + +DROP TABLE IF EXISTS rates, + users, + user_bracelet, + trainers, + activities, + activity_room; + +CREATE TABLE rates ( + id_rate CHAR(4) NOT NULL, + name_rate TEXT(15) NOT NULL, + price FLOAT(4) NOT NULL, + PRIMARY KEY (id_rate) +); + +CREATE TABLE users ( + id_user INT NOT NULL AUTO_INCREMENT, + full_name TEXT(50) NOT NULL, + phone VARCHAR(12) NOT NULL, + email VARCHAR(30) NOT NULL, + id_rate CHAR(4) NOT NULL, + PRIMARY KEY (id_user), + FOREIGN KEY (id_rate) REFERENCES rates (id_rate) ON DELETE CASCADE +); + +CREATE TABLE user_bracelet ( + bracelet_num INT(10) NOT NULL AUTO_INCREMENT, + id_user INT NOT NULL, + PRIMARY KEY (bracelet_num), + FOREIGN KEY (id_user) REFERENCES users (id_user) ON DELETE CASCADE +); + +CREATE TABLE trainers ( + id_trainer INT(2) NOT NULL AUTO_INCREMENT, + full_name TEXT(50) NOT NULL, + PRIMARY KEY (id_trainer) +); + +CREATE TABLE activity_room ( + id_room VARCHAR(5) NOT NULL, + name_room VARCHAR(20) NOT NULL, + PRIMARY KEY (id_room) +); + +CREATE TABLE activities ( + id_activity CHAR(4) NOT NULL, + name_activity VARCHAR(40) NOT NULL, + id_room VARCHAR(5) NOT NULL, + id_trainer INT(2) NOT NULL, + id_user INT NOT NULL, + PRIMARY KEY (id_activity), + FOREIGN KEY (id_room) REFERENCES activity_room (id_room) ON DELETE CASCADE, + FOREIGN KEY (id_trainer) REFERENCES trainers (id_trainer) ON DELETE CASCADE, + FOREIGN KEY (id_user) REFERENCES users (id_user) ON DELETE CASCADE +); + + +