l> INSERT INTO school (name, country, capacity)
    -> VALUES ('Castelobruxo', 'Brazil', 380),
    -> ('Durmstrang Institute', 'Norway', 570),
    -> ('Hogwarts School of Witchcraft and Wizardry', 'United Kingdom', 450),
    -> ('Hogwarts School of Witchcraft and Wizardry', 'USA', 300),
    -> ('Koldovstoretz', 'Russia', 125),
    -> ('Mahoutokoro School of Magic', 'Japan', 800),
    -> ('Uagadou School of Magic', 'Uganda', 350);
Query OK, 7 rows affected (0.05 sec)
+----+--------------------------------------------+----------+----------------+
| id | name                                       | capacity | country        |
+----+--------------------------------------------+----------+----------------+
|  1 | Beauxbatons Academy of Magic               |      550 | France         |
|  2 | Castelobruxo                               |      380 | Brazil         |
|  3 | Durmstrang Institute                       |      570 | Norway         |
|  4 | Hogwarts School of Witchcraft and Wizardry |      450 | United Kingdom |
|  5 | Hogwarts School of Witchcraft and Wizardry |      300 | USA            |
|  6 | Koldovstoretz                              |      125 | Russia         |
|  7 | Mahoutokoro School of Magic                |      800 | Japan          |
|  8 | Uagadou School of Magic                    |      350 | Uganda         |
+----+--------------------------------------------+----------+----------------+

2/ requetes de modifications
mysql> UPDATE school SET country='Sweden' WHERE id=3;
Query OK, 1 row affected (0.04 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> UPDATE school SET capacity=700  WHERE id=7;
Query OK, 1 row affected (0.05 sec)
Rows matched: 1  Changed: 1  Warnings: 0
+----+----------------------------------------------+----------+----------------+
| id | name                                         | capacity | country        |
+----+----------------------------------------------+----------+----------------+
|  1 | Beauxbatons Academy of Magic                 |      550 | France         |
|  2 | Castelobruxo                                 |      380 | Brazil         |
|  3 | Durmstrang Institute                         |      570 | Sweden         |
|  4 | Hogwarts School of Witchcraft and Wizardry   |      450 | United Kingdom |
|  5 | Ilvermorny School of Witchcraft and Wizardry |      300 | USA            |
|  6 | Koldovstoretz                                |      125 | Russia         |
|  7 | Mahoutokoro School of Magic                  |      700 | Japan          |
|  8 | Uagadou School of Magic                      |      350 | Uganda         |
+----+----------------------------------------------+----------+----------------+

3/requete de suppression
mysql> DELETE FROM school WHERE name LIKE '%Magic';
Query OK, 3 rows affected (0.05 sec)

mysql> SELECT * from school;
+----+----------------------------------------------+----------+----------------+
| id | name                                         | capacity | country        |
+----+----------------------------------------------+----------+----------------+
|  2 | Castelobruxo                                 |      380 | Brazil         |
|  3 | Durmstrang Institute                         |      570 | Sweden         |
|  4 | Hogwarts School of Witchcraft and Wizardry   |      450 | United Kingdom |
|  5 | Ilvermorny School of Witchcraft and Wizardry |      300 | USA            |
|  6 | Koldovstoretz                                |      125 | Russia         |
+----+----------------------------------------------+----------+----------------+