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Solution: Josep Romero Ros #21

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JosepR3 Nov 24, 2021
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258 changes: 258 additions & 0 deletions solution.sql
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--add employees
INSERT INTO employees values (2, '1995-03-22', 'Josep', 'Romero', 'M', '2020-08-08'),
(3, '1994-06-15', 'Juan', 'Fernandez', 'M', '2015-04-18'),
(4, '1992-10-05', 'Sara', 'Montcada', 'F', '2016-02-17'),
(5, '1990-01-22', 'Josep', 'Llagostera', 'M', '2019-05-06'),
(6, '1997-09-20', 'Josep', 'Vilagut', 'M', '2020-01-04')
(7, '1991-12-15', 'Maria', 'Cano', 'F', '2017-02-21'),
(8, '2000-10-05', 'Diana', 'Benedetto', 'F', '2020-04-27'),
(9, '1993-05-12', 'Fernando', 'Ballesteros', 'M', '2016-02-18'),
(10, '1989-02-04', 'Camila', 'Gonzalez', 'F', '2014-06-30'),
(11, '1992-12-15', 'Florencia', 'De Vicentis', 'F', '2017-01-10'),
(12, '1995-05-05', 'Ramon', 'Artegui', 'M', '2018-11-06'),
(13, '1996-08-02', 'Ramiro', 'Cuernavaca', 'M', '2018-05-06'),
(17, '1993-04-10', 'Arnold', 'Suarseneger', 'M', '2019-04-13'),
(14, '1991-02-12', 'Lionel', 'Messi', 'M', '2017-10-02'),
(15, '1997-08-14', 'Maria', 'Dubois', 'F', '2018-01-07'),
(16, '1993-11-04', 'Wisin', 'Yandel', 'M', '2020-08-12');

INSERT INTO salaries values (2, '10000','2020-08-08', NULL),
(3, '15000','2015-04-18', '2018-04-18'),
(3,'41000','2018-04-19', NULL),
(4, '23000','2016-02-17', '2018-03-17'),
(4, '41000','2018-03-18', NULL),
(5, '20000','2019-05-06', NULL),
(6, '10000','2020-01-04', NULL),
(7, '15000', '2017-02-21', NULL),
(8, '10000', '2020-04-27', NULL),
(9, '28000', '2016-02-18', '2016-02-09'),
(9, '41000', '2019-02-10', NULL),
(10, '30000', '2014-06-30', '2019-02-09'),
(10, '47000', '2019-02-10', NULL),
(11, '20000', '2017-01-10','2019-01-10'),
(11, '41000', '2019-01-11', NULL),
(12, '25000', '2018-11-06', NULL),
(13, '25000', '2018-05-06', NULL),
(17, '20000', '2019-04-13', NULL),
(14, '30000', '2017-10-02', '2019-02-09'),
(14,'40000', '2019-02-10', NULL),
(15, '25000', '2018-01-07', NULL),
(16, '10000', '2020-08-12', NULL);

INSERT INTO departments values ("A01", "Sales"),
("A04", "Accountancy"),
("A07", "Marketing"),
("A10", "CEO");

INSERT INTO dept_manager values (3, "A01", "2018-04-19", NULL),
(4, "A01", "2018-03-18", NULL),
(9, "A04", "2019-02-10", NULL),
(11, "A04", "2019-01-11", NULL),
(14, "A07", "2019-02-10", NULL),
(10, "A10", "2019-02-10", NULL);

INSERT INTO dept_emp values (2, "A01", "2020-08-08", "2021-02-09"),
(5, "A04", "2019-05-06", "2020-05-06"),
(6, "A04", "2020-01-04", "2021-01-04"),
(7, "A07", "2017-02-21", "2019-02-21"),
(8, "A07", "2020-04-27", "2021-04-26"),
(12, "A01", "2018-11-06", "2020-11-06"),
(13, "A01", "2018-05-06", "2020-05-06"),
(15, "A04", "2018-01-07", "2020-01-07"),
(16, "A04", "2020-08-12", "2021-08-12"),
(2, "A04", "2021-02-10", NULL),
(5, "A01", "2020-05-07", NULL),
(6, "A01", "2021-01-05", NULL),
(7, "A04", "2019-02-22", NULL),
(8, "A04", "2020-04-27", NULL),
(12, "A07", "2020-11-07", NULL),
(13, "A04", "2020-05-07", NULL),
(15, "A01", "2020-01-08", NULL),
(16, "A01", "2021-08-12", NULL);

INSERT INTO titles values (2, "Degree in Business", "2015-09-12", "2019-04-23"),
(3, "Master in Sales", "2015-09-12", "2017-04-23"),
(4, "Master in Sales", "2015-09-12", "2017-04-23"),
(5, "Degree in Business", "2015-09-12", "2019-04-23"),
(6, "Degree in Business", "2015-09-12", "2020-04-23"),
(7, "Degree in Business", "2015-09-12", "2019-04-23"),
(8, "Degree in Business", "2015-09-12", "2019-04-23"),
(9, "Master in Accountancy", "2015-09-12", "2018-04-23"),
(10, "MBA", "2015-09-12", "2017-04-23"),
(11, "Master in Accountancy", "2015-09-12", "2018-04-23"),
(12, "Degree in Business", "2015-09-12", "2019-04-23"),
(13, "Degree in Business", "2015-09-12", "2020-04-23"),
(14, "Master in Marketing", "2015-09-12", "2020-04-23"),
(15, "Degree in Business", "2015-09-12", "2020-04-23"),
(16, "Degree in Business", "2015-09-12", "2020-04-23"),
(17, "Degree in Business", "2015-09-12", "2019-04-23");

UPDATE employees SET first_name = "Camila" WHERE first_name = "Ramon" AND last_name = "Artegui" AND birth_date = "1995-05-05";

UPDATE departments SET dept_name = "New Sales" WHERE dept_no = "A01";
UPDATE departments SET dept_name = "New Accountancy" WHERE dept_no = "A04";
UPDATE departments SET dept_name = "New Marketing" WHERE dept_no = "A07";

SELECT * FROM salaries WHERE salary > 20000;
+--------+--------+------------+------------+
| emp_no | salary | from_date | to_date |
+--------+--------+------------+------------+
| 3 | 41000 | 2018-04-19 | 0000-00-00 |
| 4 | 23000 | 2016-02-17 | 2018-03-17 |
| 4 | 41000 | 2018-03-18 | 0000-00-00 |
| 9 | 28000 | 2016-02-18 | 2016-02-09 |
| 9 | 41000 | 2019-02-10 | 0000-00-00 |
| 10 | 30000 | 2014-06-30 | 2019-02-09 |
| 10 | 47000 | 2019-02-10 | 0000-00-00 |
| 11 | 41000 | 2019-01-11 | 0000-00-00 |
| 12 | 25000 | 2018-11-06 | 0000-00-00 |
| 13 | 25000 | 2018-05-06 | 0000-00-00 |
| 14 | 30000 | 2017-10-02 | 2019-02-09 |
| 14 | 40000 | 2019-02-10 | 0000-00-00 |
| 15 | 25000 | 2018-01-07 | 0000-00-00 |


SELECT * FROM salaries WHERE salary < 20000;
+--------+--------+------------+------------+
| emp_no | salary | from_date | to_date |
+--------+--------+------------+------------+
| 2 | 10000 | 2020-08-08 | 0000-00-00 |
| 3 | 15000 | 2015-04-18 | 2018-04-18 |
| 6 | 10000 | 2020-01-04 | 0000-00-00 |
| 7 | 18000 | 2017-02-21 | 0000-00-00 |
| 8 | 10000 | 2020-04-27 | 0000-00-00 |
| 16 | 10000 | 2020-08-12 | 0000-00-00 |
+--------+--------+------------+------------+

SELECT * FROM salaries WHERE salary < 50000 AND salary > 21000;
+--------+--------+------------+------------+
| emp_no | salary | from_date | to_date |
+--------+--------+------------+------------+
| 3 | 41000 | 2018-04-19 | 0000-00-00 |
| 4 | 23000 | 2016-02-17 | 2018-03-17 |
| 4 | 41000 | 2018-03-18 | 0000-00-00 |
| 9 | 28000 | 2016-02-18 | 2016-02-09 |
| 9 | 41000 | 2019-02-10 | 0000-00-00 |
| 10 | 30000 | 2014-06-30 | 2019-02-09 |
| 10 | 47000 | 2019-02-10 | 0000-00-00 |
| 11 | 41000 | 2019-01-11 | 0000-00-00 |
| 12 | 25000 | 2018-11-06 | 0000-00-00 |
| 13 | 25000 | 2018-05-06 | 0000-00-00 |
| 14 | 30000 | 2017-10-02 | 2019-02-09 |
| 14 | 40000 | 2019-02-10 | 0000-00-00 |
| 15 | 25000 | 2018-01-07 | 0000-00-00 |
+--------+--------+------------+------------+

SELECT COUNT(*) FROM employees;
+----------+
| COUNT(*) |
+----------+
| 16 |
+----------+

SELECT emp_no, COUNT(*) FROM dept_emp GROUP BY emp_no HAVING COUNT(*)>1;
+--------+----------+
| emp_no | COUNT(*) |
+--------+----------+
| 2 | 2 |
| 5 | 2 |
| 6 | 2 |
| 7 | 2 |
| 8 | 2 |
| 12 | 2 |
| 13 | 2 |
| 15 | 2 |
| 16 | 2 |
+--------+----------+

SELECT * FROM titles WHERE to_date BETWEEN "2019-01-01" AND "2019-12-31";
+--------+--------------------+------------+------------+
| emp_no | title | from_date | to_date |
+--------+--------------------+------------+------------+
| 2 | Degree in Business | 2015-09-12 | 2019-04-23 |
| 5 | Degree in Business | 2015-09-12 | 2019-04-23 |
| 7 | Degree in Business | 2015-09-12 | 2019-04-23 |
| 8 | Degree in Business | 2015-09-12 | 2019-04-23 |
| 12 | Degree in Business | 2015-09-12 | 2019-04-23 |
| 17 | Degree in Business | 2015-09-12 | 2019-04-23 |
+--------+--------------------+------------+------------+

SELECT UCASE(first_name) FROM employees;
+-------------------+
| UCASE(first_name) |
+-------------------+
| JOSEP |
| JUAN |
| SARA |
| JOSEP |
| JOSEP |
| MARIA |
| DIANA |
| FERNANDO |
| CAMILA |
| FLORENCIA |
| CAMILA |
| RAMIRO |
| LIONEL |
| MARIA |
| WISIN |
| ARNOLD |
+-------------------+

SELECT employees.first_name, employees.last_name, dept_emp.dept_no FROM employees INNER JOIN dept_emp ON employees.emp_no = dept_emp.emp_no;
+------------+------------+---------+
| first_name | last_name | dept_no |
+------------+------------+---------+
| Josep | Romero | A01 |
| Josep | Romero | A04 |
| Josep | Llagostera | A01 |
| Josep | Llagostera | A04 |
| Josep | Vilagut | A01 |
| Josep | Vilagut | A04 |
| Maria | Cano | A04 |
| Maria | Cano | A07 |
| Diana | Benedetto | A04 |
| Diana | Benedetto | A07 |
| Camila | Artegui | A01 |
| Camila | Artegui | A07 |
| Ramiro | Cuernavaca | A01 |
| Ramiro | Cuernavaca | A04 |
| Maria | Dubois | A01 |
| Maria | Dubois | A04 |
| Wisin | Yandel | A01 |
| Wisin | Yandel | A04 |
+------------+------------+---------+

SELECT COUNT(dept_manager.emp_no), employees.first_name, employees.last_name FROM dept_manager INNER JOIN employees ON dept_manager.emp_no = employees.emp_no GROUP BY dept_manager.emp_no HAVING COUNT(dept_manager.emp_no)>0;
+----------------------------+------------+-------------+
| COUNT(dept_manager.emp_no) | first_name | last_name |
+----------------------------+------------+-------------+
| 1 | Juan | Fernandez |
| 1 | Sara | Montcada |
| 1 | Fernando | Ballesteros |
| 1 | Camila | Gonzalez |
| 1 | Florencia | De Vicentis |
| 1 | Lionel | Messi |
+----------------------------+------------+-------------+

SELECT DISTINCT first_name FROM employees;
+------------+
| first_name |
+------------+
| Josep |
| Juan |
| Sara |
| Maria |
| Diana |
| Fernando |
| Camila |
| Florencia |
| Ramiro |
| Lionel |
| Wisin |
| Arnold |
+------------+

DELETE employees, salaries FROM employees JOIN salaries ON employees.emp_no = salaries.emp_no WHERE salaries.salary > 20000;

DELETE departments FROM departments JOIN dept_emp ON departments.dept_no = dept_emp.dept_no WHERE COUNT()