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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 `tabone`
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CREATE TABLE `tabone`
( `id` INTEGER UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
`b1` blob NOT NULL,
`b2` blob NOT NULL,
`b3` blob NOT NULL,
`b4` blob NOT NULL
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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DROP TABLE IF EXISTS `tabtwo`
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CREATE TABLE `tabtwo`
( `id` INTEGER UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
`barcode` TEXT NOT NULL
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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DROP TRIGGER IF EXISTS `maj`
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CREATE TRIGGER `maj`
AFTER INSERT ON `tabone`
FOR EACH ROW
BEGIN
insert into `tabtwo` (`id`,`barcode`)values (new.id, concat(new.b1,new.b2,new.b3,new.b4));
END
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insert into `tabone` (`b1`,`b2`,`b3`,`b4`) values
('xxxx', 'yyyy', 'zzzz', 'tttt'),
('aaaa', 'bbbb', 'cccc', 'dddd')
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select * from `tabone`
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+----+------+------+------+------+
| id | b1 | b2 | b3 | b4 |
+----+------+------+------+------+
| 1 | xxxx | yyyy | zzzz | tttt |
| 2 | aaaa | bbbb | cccc | dddd |
+----+------+------+------+------+
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select * from `tabtwo`
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+----+------------------+
| id | barcode |
+----+------------------+
| 1 | xxxxyyyyzzzztttt |
| 2 | aaaabbbbccccdddd |
+----+------------------+
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COMMIT
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SET AUTOCOMMIT = 1
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