Solution: Valentino Traverso

README.md

@@ -1,15 +1,26 @@
-# 💊 MySQL Basics
+# 💊 MySQL Basics - Valentino Traverso
 
-_MySQL, SQL language, setting environment variables._
+This is the MySQL Basics project develop by Valentino Traverso.
 
-## 📔 Description
+## 📔 How its related my DB
 
-Intro pill which served as our first contact with the DBMS "MySQL", where we set an environment variable to be able to run the program from the command line, imported an example database from a ".sql" file provided by the official MySQL team, and executed some queries to play around with a DB and to getting familiar with the SQL language.
+I create a DB where i could save the data about my jobs.
 
-### 📂 Content
+### Tables
 
-This repository contains only the following files:
+- [Skills]
+Here its where i store my soft and hard skills.
+This table its related with all the jobs i had and with my titles.
 
-- **_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.
+- [Titles]
+This one its use to save info about my education.
+Its related with my jobs because is where i used the knowledge aquire of each one.
+
+- [Jobs]
+In this one i store the jobs that i had and where im currently working.
+
+- [Partners]
+Here i could save the information about the people that use to work with me in evey jobs, thats the reason is connected to jobs table.
+
+- [Hobbies]
+This table is used to store my personal hobbies that i use to do when im free.

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;