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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 `ordre`
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CREATE TABLE `ordre`
( `id` integer unsigned NOT NULL auto_increment primary key,
`val` varchar(255) NOT NULL
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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INSERT INTO `ordre` (`val`) values
('jaune'),('vert'),('bleu'),('rouge')
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select * from ordre
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+----+-------+
| id | val |
+----+-------+
| 1 | jaune |
| 2 | vert |
| 3 | bleu |
| 4 | rouge |
+----+-------+
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DROP TABLE IF EXISTS `test`
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CREATE TABLE `test`
( `id` integer unsigned NOT NULL auto_increment primary key,
`tri` integer unsigned NOT NULL,
`ordre_id` integer unsigned NOT NULL,
CONSTRAINT `FK_test_orderid` FOREIGN KEY (`ordre_id`) REFERENCES `ordre` (`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 `test` (`tri`, `ordre_id`) values
(1,2),(1,1),(2,3),(2,2),(3,3),(3,4),(4,1),(4,4),(5,3),(5,4),(6,2),(6,4)
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select * from test
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+----+-----+----------+
| id | tri | ordre_id |
+----+-----+----------+
| 1 | 1 | 2 |
| 2 | 1 | 1 |
| 3 | 2 | 3 |
| 4 | 2 | 2 |
| 5 | 3 | 3 |
| 6 | 3 | 4 |
| 7 | 4 | 1 |
| 8 | 4 | 4 |
| 9 | 5 | 3 |
| 10 | 5 | 4 |
| 11 | 6 | 2 |
| 12 | 6 | 4 |
+----+-----+----------+
--------------
select tb1.id, tb1.tri, tb2.val
from test as tb1
inner join ordre as tb2
on tb2.id = tb1.ordre_id
order by tb1.id
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+----+-----+-------+
| id | tri | val |
+----+-----+-------+
| 1 | 1 | vert |
| 2 | 1 | jaune |
| 3 | 2 | bleu |
| 4 | 2 | vert |
| 5 | 3 | bleu |
| 6 | 3 | rouge |
| 7 | 4 | jaune |
| 8 | 4 | rouge |
| 9 | 5 | bleu |
| 10 | 5 | rouge |
| 11 | 6 | vert |
| 12 | 6 | rouge |
+----+-----+-------+
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select tb1.tri, substring_index(group_concat(distinct tb2.val order by tb2.id), ',', 1) as val
from test as tb1
inner join ordre as tb2
on tb2.id = tb1.ordre_id
group by tb1.tri
order by tb1.tri
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+-----+-------+
| tri | val |
+-----+-------+
| 1 | jaune |
| 2 | vert |
| 3 | bleu |
| 4 | jaune |
| 5 | bleu |
| 6 | vert |
+-----+-------+
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COMMIT
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SET AUTOCOMMIT = 1
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