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START TRANSACTION
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--------------
DROP DATABASE IF EXISTS `base`
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--------------
CREATE DATABASE IF NOT EXISTS `base`
DEFAULT CHARACTER SET `latin1`
DEFAULT COLLATE `latin1_general_ci`
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--------------
DROP TABLE IF EXISTS `data`
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--------------
CREATE TABLE `data`
( `id` integer unsigned NOT NULL auto_increment PRIMARY KEY,
`type_lieu` tinyint unsigned NOT NULL,
`numero_lieu` tinyint unsigned NOT NULL
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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insert into `data` (`type_lieu`,`numero_lieu`) values
(1,1),(2,2),(1,2),(2,1),(1,4),(2,3)
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select * from `data`
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+----+-----------+-------------+
| id | type_lieu | numero_lieu |
+----+-----------+-------------+
| 1 | 1 | 1 |
| 2 | 2 | 2 |
| 3 | 1 | 2 |
| 4 | 2 | 1 |
| 5 | 1 | 4 |
| 6 | 2 | 3 |
+----+-----------+-------------+
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DROP TABLE IF EXISTS `lieux1`
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--------------
CREATE TABLE `lieux1`
( `id` integer unsigned NOT NULL auto_increment PRIMARY KEY,
`nom` varchar(255) NOT NULL
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
--------------
--------------
insert into `lieux1` (`nom`) values
('un'), ('deux'), ('trois'), ('quatre')
--------------
--------------
select * from `lieux1`
--------------
+----+--------+
| id | nom |
+----+--------+
| 1 | un |
| 2 | deux |
| 3 | trois |
| 4 | quatre |
+----+--------+
--------------
DROP TABLE IF EXISTS `lieux2`
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--------------
CREATE TABLE `lieux2`
( `id` integer unsigned NOT NULL auto_increment PRIMARY KEY,
`nom` varchar(255) NOT NULL
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
--------------
--------------
insert into `lieux2` (`nom`) values
('one'), ('two'), ('three'), ('four')
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select * from `lieux2`
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+----+-------+
| id | nom |
+----+-------+
| 1 | one |
| 2 | two |
| 3 | three |
| 4 | four |
+----+-------+
--------------
select t1.id,
t1.type_lieu,
t1.numero_lieu,
case t1.type_lieu when 1 then t2.nom when 2 then t3.nom else NULL end as nom
from `data` as t1
left outer join `lieux1` as t2
on t2.id = t1.numero_lieu
left outer join `lieux2` as t3
on t3.id = t1.numero_lieu
order by nom
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+----+-----------+-------------+--------+
| id | type_lieu | numero_lieu | nom |
+----+-----------+-------------+--------+
| 3 | 1 | 2 | deux |
| 4 | 2 | 1 | one |
| 5 | 1 | 4 | quatre |
| 6 | 2 | 3 | three |
| 2 | 2 | 2 | two |
| 1 | 1 | 1 | un |
+----+-----------+-------------+--------+
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COMMIT
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