sentencias.sql

CREATE TABLE employees (
    id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY, -- No necesario
    first_name VARCHAR(50) NOT NULL,
    last_name VARCHAR(50) NOT NULL,
    email VARCHAR(100) NOT NULL UNIQUE,
    hire_at DATE,  -- No necesario
    salary DECIMAL(10, 2) NOT NULL,
    status ENUM('active', 'inactive') DEFAULT 'active', -- No necesario
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP -- No necesario
);

CREATE TABLE projects(
    id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    name  VARCHAR(50),
    description TEXT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- M:M
CREATE TABLE project_employees(
    id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    
    employe_id INT UNSIGNED NOT NULL,
    project_id INT UNSIGNED NOT NULL,
    
    FOREIGN KEY (project_id) REFERENCES projects(id) ON DELETE CASCADE,
    FOREIGN KEY (employe_id) REFERENCES employees(id) ON DELETE CASCADE,

    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

INSERT INTO projects(name, description) VALUES ('test', 'test');

-- CRUD
INSERT INTO employees(first_name, last_name, email, salary) VALUES ('Eduardo', 'García', '[email protected]', 1000.00);

SELECT * FROM employees;

UPDATE employees SET first_name = 'user1', last_name = 'user1'; -- UPDATE
UPDATE employees SET first_name = 'Eduardo', last_name = 'García' WHERE id = 1;

DELETE FROM employees
WHERE id = 1;

TRUNCATE employees;

-- ON DELETE CASCADE

INSERT INTO employees (id, first_name, last_name, email, hire_at, salary, created_at, status)
VALUES
    (1, 'John', 'Doe', '[email protected]', '2022-01-10', 50000.00, NOW(), 'active'),
    (2, 'Jane', 'Smith', '[email protected]', '2022-02-15', 55000.00, NOW(), 'active'),
    (3, 'Michael', 'Johnson', '[email protected]', '2022-03-20', 60000.00, NOW(), 'inactive'),
    (4, 'Emily', 'Williams', '[email protected]', '2022-04-25', 52000.00, NOW(), 'active'),
    (5, 'William', 'Brown', '[email protected]', '2022-05-30', 48000.00, NOW(), 'active'),
    (6, 'Olivia', 'Jones', '[email protected]', '2022-06-05', 53000.00, NOW(), 'active'),
    (7, 'James', 'Davis', '[email protected]', '2022-07-10', 55000.00, NOW(), 'active'),
    (8, 'Emma', 'Miller', '[email protected]', '2022-08-15', 60000.00, NOW(), 'active'),
    (9, 'Benjamin', 'Garcia', '[email protected]', '2022-09-20', 49000.00, NOW(), 'active'),
    (10, 'Sophia', 'Martinez', '[email protected]', '2022-10-25', 54000.00, NOW(), 'active'),
    (11, 'Liam', 'Rodriguez', '[email protected]', '2022-11-30', 51000.00, NOW(), 'active'),
    (12, 'Ava', 'Lopez', '[email protected]', '2022-12-05', 59000.00, NOW(), 'active'),
    (13, 'Henry', 'Hernandez', '[email protected]', '2023-01-10', 50000.00, NOW(), 'inactive'),
    (14, 'Mia', 'Gonzalez', '[email protected]', '2023-02-15', 55000.00, NOW(), 'active'),
    (15, 'Alexander', 'Perez', '[email protected]', '2023-03-20', 60000.00, NOW(), 'active'),
    (16, 'Ella', 'Wilson', '[email protected]', '2023-04-25', 52000.00, NOW(), 'active'),
    (17, 'Daniel', 'Moore', '[email protected]', '2023-05-30', 48000.00, NOW(), 'active'),
    (18, 'Grace', 'Taylor', '[email protected]', '2023-06-05', 53000.00, NOW(), 'active'),
    (19, 'Michael', 'Jackson', '[email protected]', '2023-07-10', 55000.00, NOW(), 'active'),
    (20, 'Chloe', 'White', '[email protected]', '2023-08-15', 60000.00, NOW(), 'active'),
    (21, 'William', 'Harris', '[email protected]', '2023-09-20', 49000.00, NOW(), 'inactive'),
    (22, 'Sophia', 'Clark', '[email protected]', '2023-10-25', 54000.00, NOW(), 'active'),
    (23, 'Ethan', 'Lewis', '[email protected]', '2023-11-30', 51000.00, NOW(), 'active'),
    (24, 'Isabella', 'Walker', '[email protected]', '2023-12-05', 59000.00, NOW(), 'active'),
    (25, 'James', 'Young', '[email protected]', '2024-01-10', 50000.00, NOW(), 'active'),
    (26, 'Avery', 'Wright', '[email protected]', '2024-02-15', 55000.00, NOW(), 'active'),
    (27, 'Logan', 'Martin', '[email protected]', '2024-03-20', 60000.00, NOW(), 'active'),
    (28, 'Sophia', 'Hall', '[email protected]', '2024-04-25', 52000.00, NOW(), 'active'),
    (29, 'Henry', 'Allen', '[email protected]', '2024-01-19', 48000.00, NOW(), 'active'),
    (30, 'Olivia', 'Baker', '[email protected]', '2024-01-19', 53000.00, NOW(), 'active');

-- Obtener la cantidad de empleados contratados este año.
-- SELECT * FROM employees WHERE hire_at > '2024-01-01 00:00:00';
-- SELECT COUNT(*) FROM employees WHERE YEAR(hire_at) = 2024;
SELECT COUNT(*) AS empleados_contratados_este_ano  FROM employees WHERE YEAR(hire_at) = YEAR(CURDATE());
SELECT COUNT(*) AS TOTAL_EMPLEADOS FROM employees WHERE YEAR(HIRE_AT) = 2024;

-- Obtener la cantidad de empleados contratados en 2023 y 2024.
-- SELECT COUNT(*) AS TOTAL_EMPLEADOS FROM employees WHERE YEAR(HIRE_AT) = 2023 OR YEAR(HIRE_AT) 2024
-- SELECT COUNT(*) AS TOTAL_EMPLEADOS FROM employees WHERE YEAR(HIRE_AT) IN (2023, 2024)
SELECT COUNT(*) AS TOTAL_EMPLEADOS FROM employees WHERE YEAR(HIRE_AT) BETWEEN 2023 AND 2024

-- Obtener el nombre completo de todos los empleados inactivos.
SELECT CONCAT(first_name, ' ', last_name) AS full_name FROM employees WHERE status = 'inactive';


-- Obtener el nombre de todos los usuarios con correo con dominio codigofacilito.
SELECT first_name FROM employees WHERE email LIKE '%@codigofacilito.com';

-- Obtener el año en el que más usuarios se registraron.
-- COUNT, SUM, MAX, MIN, AVG
SELECT 
    YEAR(hire_at) AS _year,
    COUNT(*) as total 
FROM employees 
GROUP BY _year 
ORDER BY total 
DESC LIMIT 1;

-- Obtener el top 5 de empleados mejores pagados.
SELECT * FROM employees 
ORDER BY salary
DESC LIMIT 5;

-- Obtener el usuario más antigüedad.
SELECT * FROM employees 
WHERE hire_at IS NOT NULL
ORDER BY hire_at ASC LIMIT 1;

-- Obtener el nombre completo y correo de todos los usuarios que tengan por lo menos un proyecto

Obtener el nombre completo y correo de todos los usuarios que tengan por lo menos un proyecto
Obtener la cantidad de usuarios con más de un proyecto asignado.
Obtener el nombre completo y correo del usuario con más proyectos asignados.