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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 `test`
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CREATE TABLE `test`
(
`id` integer unsigned NOT NULL AUTO_INCREMENT,
`lib` varchar(255) NOT NULL,
`rang` integer NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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INSERT INTO test (`lib`,`rang`) VALUES
('alpha', 0),('beta', 0),('gamma', 0),('beta', 0),('beta', 0),('beta', 0)
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select * from test
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+----+-------+------+
| id | lib | rang |
+----+-------+------+
| 1 | alpha | 0 |
| 2 | beta | 0 |
| 3 | gamma | 0 |
| 4 | beta | 0 |
| 5 | beta | 0 |
| 6 | beta | 0 |
+----+-------+------+
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UPDATE test, (select @a:=0) as x
SET lib = 'test',
rang = (@a := @a + 1)
WHERE lib = 'beta'
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select * from test
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+----+-------+------+
| id | lib | rang |
+----+-------+------+
| 1 | alpha | 0 |
| 2 | test | 1 |
| 3 | gamma | 0 |
| 4 | test | 2 |
| 5 | test | 3 |
| 6 | test | 4 |
+----+-------+------+
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COMMIT
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SET AUTOCOMMIT = 1
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