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| --------------
SET AUTOCOMMIT = 0
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--------------
START TRANSACTION
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--------------
DROP DATABASE IF EXISTS `base`
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--------------
CREATE DATABASE `base`
DEFAULT CHARACTER SET `latin1`
DEFAULT COLLATE `latin1_general_ci`
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DROP TABLE IF EXISTS `user`
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CREATE TABLE `user`
( `id` integer unsigned not null auto_increment primary key,
`nom` varchar(255) not null,
`prenom` varchar(255) not null,
`email` varchar(255) not null,
`password` varchar(255) not null
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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insert into `user` (`nom`,`prenom`,`email`,`password`) values
('nom 1','prénom 1','prenom1.nom1@email.com','password1'),
('nom 2','prénom 2','prenom2.nom2@email.com','password2'),
('nom 3','prénom 3','prenom3.nom3@email.com','password3')
--------------
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select * from `user`
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+----+-------+----------+------------------------+-----------+
| id | nom | prenom | email | password |
+----+-------+----------+------------------------+-----------+
| 1 | nom 1 | prénom 1 | prenom1.nom1@email.com | password1 |
| 2 | nom 2 | prénom 2 | prenom2.nom2@email.com | password2 |
| 3 | nom 3 | prénom 3 | prenom3.nom3@email.com | password3 |
+----+-------+----------+------------------------+-----------+
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DROP TABLE IF EXISTS `friend`
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CREATE TABLE `friend`
( `id` integer unsigned not null auto_increment primary key,
`cas` char(01) not null,
`id_exp` integer unsigned not null,
`id_des` integer unsigned not null,
CONSTRAINT `fk_exp` FOREIGN KEY (`id_exp`) REFERENCES `user` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT `fk_des` FOREIGN KEY (`id_des`) REFERENCES `user` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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insert into `friend` (`cas`, `id_exp`,`id_des`) values
('a', 1, 2), ('a', 1, 3), ('a', 2, 3),
('b', 1, 2), ('b', 1, 3), ('b', 3, 2),
('c', 1, 2), ('c', 3, 1), ('c', 2, 3),
('d', 1, 2), ('d', 3, 1), ('d', 3, 2),
('e', 2, 1), ('e', 1, 3), ('e', 2, 3),
('f', 2, 1), ('f', 1, 3), ('f', 3, 2),
('g', 2, 1), ('g', 3, 1), ('g', 2, 3),
('h', 2, 1), ('h', 3, 1), ('h', 3, 2)
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select * from `friend`
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+----+-----+--------+--------+
| id | cas | id_exp | id_des |
+----+-----+--------+--------+
| 1 | a | 1 | 2 |
| 2 | a | 1 | 3 |
| 3 | a | 2 | 3 |
| 4 | b | 1 | 2 |
| 5 | b | 1 | 3 |
| 6 | b | 3 | 2 |
| 7 | c | 1 | 2 |
| 8 | c | 3 | 1 |
| 9 | c | 2 | 3 |
| 10 | d | 1 | 2 |
| 11 | d | 3 | 1 |
| 12 | d | 3 | 2 |
| 13 | e | 2 | 1 |
| 14 | e | 1 | 3 |
| 15 | e | 2 | 3 |
| 16 | f | 2 | 1 |
| 17 | f | 1 | 3 |
| 18 | f | 3 | 2 |
| 19 | g | 2 | 1 |
| 20 | g | 3 | 1 |
| 21 | g | 2 | 3 |
| 22 | h | 2 | 1 |
| 23 | h | 3 | 1 |
| 24 | h | 3 | 2 |
+----+-----+--------+--------+
--------------
select x.cas,
x.val,
u.nom,
u.prenom
from ( select cas,
id_des as val
from `friend`
where id_exp = 1
union
select cas,
id_exp as val
from `friend`
where id_des = 1
) as x
inner join ( select cas,
id_des as val
from `friend`
where id_exp = 2
union
select cas,
id_exp as val
from `friend`
where id_des = 2
) as y
inner join user as u
on u.id = x.val
where x.cas = y.cas
and x.val = y.val
order by x.cas
--------------
+-----+-----+-------+----------+
| cas | val | nom | prenom |
+-----+-----+-------+----------+
| a | 3 | nom 3 | prénom 3 |
| b | 3 | nom 3 | prénom 3 |
| c | 3 | nom 3 | prénom 3 |
| d | 3 | nom 3 | prénom 3 |
| e | 3 | nom 3 | prénom 3 |
| f | 3 | nom 3 | prénom 3 |
| g | 3 | nom 3 | prénom 3 |
| h | 3 | nom 3 | prénom 3 |
+-----+-----+-------+----------+
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COMMIT
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SET AUTOCOMMIT = 1
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