03_datahandling

1.) “Durmstrang Institute” is actually in Sweden (Sweden), so modify its country.

mysql> UPDATE school SET country='Sweden' WHERE name='Durmstrang Institute';
Query OK, 1 row affected (0.05 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> SELECT * FROM school
    -> SELECT * FROM school;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SELECT * FROM school' at line 2
mysql> SELECT * FROM school;
+----+----------------------------------------------+----------+----------------+
| 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                  |      800 | Japan          |
|  8 | Uagadou School of Magic                      |      350 | Uganda         |
+----+----------------------------------------------+----------+----------------+

2.)“Mahoutokoro School of Magic” should have its pupil capacity reduced to 700.

mysql> UPDATE school SET capacity=700 WHERE name='Mahoutokoro School of Magic';
Query OK, 1 row affected (0.04 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> SELECT * FROM school;
+----+----------------------------------------------+----------+----------------+
| 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.)Delete all the schools containing the word “Magic” (there are 3) in their titles in a single request. The LIKE keyword may be of help to you.

mysql> DELETE FROM school WHERE name LIKE '%Magic%';
Query OK, 3 rows affected (0.04 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         |
+----+----------------------------------------------+----------+----------------+
5 rows in set (0.00 sec)