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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 `test`
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create table `test`
( `id` integer unsigned not null auto_increment primary key,
`journee` date not null
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_swedish_ci`
ROW_FORMAT=COMPRESSED
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INSERT INTO `test` (`journee`) VALUES
('2019-01-01'),('2019-02-01'),('2019-03-01'),('2019-04-01'),('2019-05-01')
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select * from `test`
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+----+------------+
| id | journee |
+----+------------+
| 1 | 2019-01-01 |
| 2 | 2019-02-01 |
| 3 | 2019-03-01 |
| 4 | 2019-04-01 |
| 5 | 2019-05-01 |
+----+------------+
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commit
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ALTER TABLE `test` ADD COLUMN `journee_bis` date null default NULL after `journee`
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update `test` set `journee_bis` = `journee` + interval 7 day
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select * from `test`
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+----+------------+-------------+
| id | journee | journee_bis |
+----+------------+-------------+
| 1 | 2019-01-01 | 2019-01-08 |
| 2 | 2019-02-01 | 2019-02-08 |
| 3 | 2019-03-01 | 2019-03-08 |
| 4 | 2019-04-01 | 2019-04-08 |
| 5 | 2019-05-01 | 2019-05-08 |
+----+------------+-------------+
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ALTER TABLE `test` DROP COLUMN `journee`
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ALTER TABLE `test` RENAME COLUMN `journee_bis` TO `journee`
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select * from `test`
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+----+------------+
| id | journee |
+----+------------+
| 1 | 2019-01-08 |
| 2 | 2019-02-08 |
| 3 | 2019-03-08 |
| 4 | 2019-04-08 |
| 5 | 2019-05-08 |
+----+------------+
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COMMIT
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