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| --------------
SET AUTOCOMMIT = 0
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--------------
START TRANSACTION
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--------------
show variables like 'version'
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+---------------+------------+
| Variable_name | Value |
+---------------+------------+
| version | 5.7.17-log |
+---------------+------------+
--------------
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 primary key,
`nom` varchar(255) not null,
`prenom` varchar(255) not null,
`naissance` date not null,
`id_eleve` varchar(255) not null
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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DROP TRIGGER IF EXISTS `eleve`
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CREATE TRIGGER `eleve`
BEFORE INSERT ON `test`
FOR EACH ROW BEGIN
SET NEW.id_eleve=concat(left(new.nom,1),'_',left(new.prenom,1),'_',dayofmonth(new.naissance));
END
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insert into `test` (`nom`,`prenom`,`naissance`) values
('daudet', 'alphonse', '1840-05-13'),
('blum', 'leon', '1872-04-09'),
('marchais', 'georges', '1920-06-07')
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select * from test
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+----+----------+----------+------------+----------+
| id | nom | prenom | naissance | id_eleve |
+----+----------+----------+------------+----------+
| 1 | daudet | alphonse | 1840-05-13 | d_a_13 |
| 2 | blum | leon | 1872-04-09 | b_l_9 |
| 3 | marchais | georges | 1920-06-07 | m_g_7 |
+----+----------+----------+------------+----------+
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COMMIT
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SET AUTOCOMMIT = 1
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