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| --------------
SET AUTOCOMMIT = 0
--------------
--------------
START TRANSACTION
--------------
--------------
DROP DATABASE IF EXISTS `base`
--------------
--------------
CREATE DATABASE `base`
DEFAULT CHARACTER SET `latin1`
DEFAULT COLLATE `latin1_general_ci`
--------------
--------------
drop table if exists `pays`
--------------
--------------
CREATE TABLE `pays`
( `id` integer unsigned NOT NULL auto_increment primary key,
`code` char(03) NOT NULL,
`pays` varchar(255) NOT NULL
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
--------------
--------------
insert into `pays` (`code`,`pays`) values
('afg', 'Afghanistan'),
('can', 'Canada'),
('gbr', 'Royaume-Uni')
--------------
--------------
select * from pays
--------------
+----+------+-------------+
| id | code | pays |
+----+------+-------------+
| 1 | afg | Afghanistan |
| 2 | can | Canada |
| 3 | gbr | Royaume-Uni |
+----+------+-------------+
--------------
drop table if exists `ville`
--------------
--------------
CREATE TABLE `ville`
( `id` integer unsigned NOT NULL auto_increment primary key,
`ville` varchar(255) NOT NULL,
`clef_pays` integer unsigned NOT NULL,
CONSTRAINT `FK_VILLE` FOREIGN KEY (`clef_pays`) REFERENCES `pays` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
--------------
--------------
insert into `ville` (`ville`,`clef_pays`) values
('Kaboul', 1), ('Kandahar', 1), ('Hérat', 1),
('Montréal', 2), ('Toronto', 2), ('Ottawa', 2), ('Calgary', 2), ('Vancouver', 2),
('Londres', 3), ('Manchester', 3), ('Liverpool', 3), ('Glasgow', 3), ('Belfast', 3)
--------------
--------------
select * from ville
--------------
+----+------------+-----------+
| id | ville | clef_pays |
+----+------------+-----------+
| 1 | Kaboul | 1 |
| 2 | Kandahar | 1 |
| 3 | Hérat | 1 |
| 4 | Montréal | 2 |
| 5 | Toronto | 2 |
| 6 | Ottawa | 2 |
| 7 | Calgary | 2 |
| 8 | Vancouver | 2 |
| 9 | Londres | 3 |
| 10 | Manchester | 3 |
| 11 | Liverpool | 3 |
| 12 | Glasgow | 3 |
| 13 | Belfast | 3 |
+----+------------+-----------+
--------------
drop table if exists `capitale`
--------------
--------------
CREATE TABLE `capitale`
( `clef_pays` integer unsigned NOT NULL,
`clef_ville` integer unsigned NOT NULL,
CONSTRAINT `FK_CAPITALE_PAYS` FOREIGN KEY (`clef_pays`) REFERENCES `pays` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT `FK_CAPITALE_VILLE` FOREIGN KEY (`clef_ville`) REFERENCES `ville` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
primary key (`clef_pays`,`clef_ville`)
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
--------------
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insert into `capitale` (`clef_pays`,`clef_ville`) values
(1,1), (2,6), (3,9)
--------------
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select * from capitale
--------------
+-----------+------------+
| clef_pays | clef_ville |
+-----------+------------+
| 1 | 1 |
| 2 | 6 |
| 3 | 9 |
+-----------+------------+
--------------
select v1.ville,
p.pays,
v2.ville as capitale
from ville as v1
inner join pays as p
on p.id = v1.clef_pays
inner join capitale as c
on c.clef_pays = p.id
inner join ville as v2
on v2.id = c.clef_ville
where v2.ville = 'Londres'
--------------
+------------+-------------+----------+
| ville | pays | capitale |
+------------+-------------+----------+
| Londres | Royaume-Uni | Londres |
| Manchester | Royaume-Uni | Londres |
| Liverpool | Royaume-Uni | Londres |
| Glasgow | Royaume-Uni | Londres |
| Belfast | Royaume-Uni | Londres |
+------------+-------------+----------+
--------------
COMMIT
--------------
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SET AUTOCOMMIT = 1
--------------
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