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| --------------
SET AUTOCOMMIT = 0
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--------------
START TRANSACTION
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DROP DATABASE IF EXISTS `base`
--------------
--------------
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,
`date` date NOT NULL,
`duree` integer NOT NULL
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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INSERT INTO `test` (`date`,`duree`) value
('2016-01-01', -31),
('2016-01-01', +31)
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select * from `test`
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+----+------------+-------+
| id | date | duree |
+----+------------+-------+
| 1 | 2016-01-01 | -31 |
| 2 | 2016-01-01 | 31 |
+----+------------+-------+
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select id, date, duree, adddate(date, duree) as newdate
from test
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+----+------------+-------+------------+
| id | date | duree | newdate |
+----+------------+-------+------------+
| 1 | 2016-01-01 | -31 | 2015-12-01 |
| 2 | 2016-01-01 | 31 | 2016-02-01 |
+----+------------+-------+------------+
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COMMIT
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SET AUTOCOMMIT = 1
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