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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 `bienstest`
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CREATE TABLE `bienstest`
( `id` integer unsigned NOT NULL auto_increment primary key,
`reference` char(30) NOT NULL,
`quantite` smallint unsigned NOT NULL
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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insert into `bienstest` (`reference`,`quantite`) values
(2,1000),(2,3000),(4,1000),(4,3000),(6,1000),(6,3000),(6,5000),(8,1000)
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select * from `bienstest`
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+----+-----------+----------+
| id | reference | quantite |
+----+-----------+----------+
| 1 | 2 | 1000 |
| 2 | 2 | 3000 |
| 3 | 4 | 1000 |
| 4 | 4 | 3000 |
| 5 | 6 | 1000 |
| 6 | 6 | 3000 |
| 7 | 6 | 5000 |
| 8 | 8 | 1000 |
+----+-----------+----------+
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delete t1 from `bienstest` as t1
inner join `bienstest` as t2
on t2.reference = t1.reference
where t2.quantite > t1.quantite
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select * from `bienstest`
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+----+-----------+----------+
| id | reference | quantite |
+----+-----------+----------+
| 2 | 2 | 3000 |
| 4 | 4 | 3000 |
| 7 | 6 | 5000 |
| 8 | 8 | 1000 |
+----+-----------+----------+
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COMMIT
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