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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 `messages_r`
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CREATE TABLE `messages_r`
( `idMessages_r` integer unsigned NOT NULL auto_increment primary key,
`idMembre` integer unsigned NOT NULL,
`Date` date NOT NULL
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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insert into `messages_r` (`idMessages_r`,`idMembre`,`Date`) values
(57, 59, '2016-08-29'),
(56, 59, '2016-08-29'),
(55, 59, '2016-08-29'),
(54, 58, '2016-08-29'),
(53, 59, '2016-08-29'),
(52, 57, '2016-08-29')
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select * from messages_r
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+--------------+----------+------------+
| idMessages_r | idMembre | Date |
+--------------+----------+------------+
| 52 | 57 | 2016-08-29 |
| 53 | 59 | 2016-08-29 |
| 54 | 58 | 2016-08-29 |
| 55 | 59 | 2016-08-29 |
| 56 | 59 | 2016-08-29 |
| 57 | 59 | 2016-08-29 |
+--------------+----------+------------+
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set @idM_r = 57
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set @IdMembre = 59
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set @idM_r = (select max(idMessages_r) from messages_r where IdMessages_r < @idM_r and idMembre = @IdMembre)
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select @idM_r
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+--------+
| @idM_r |
+--------+
| 56 |
+--------+
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set @idM_r = (select max(idMessages_r) from messages_r where IdMessages_r < @idM_r and idMembre = @IdMembre)
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select @idM_r
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+--------+
| @idM_r |
+--------+
| 55 |
+--------+
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set @idM_r = (select max(idMessages_r) from messages_r where IdMessages_r < @idM_r and idMembre = @IdMembre)
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select @idM_r
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+--------+
| @idM_r |
+--------+
| 53 |
+--------+
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set @idM_r = 51
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set @IdMembre = 59
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set @idM_r = (select min(idMessages_r) from messages_r where IdMessages_r > @idM_r and idMembre = @IdMembre)
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select @idM_r
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+--------+
| @idM_r |
+--------+
| 53 |
+--------+
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set @idM_r = (select min(idMessages_r) from messages_r where IdMessages_r > @idM_r and idMembre = @IdMembre)
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select @idM_r
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+--------+
| @idM_r |
+--------+
| 55 |
+--------+
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set @idM_r = (select min(idMessages_r) from messages_r where IdMessages_r > @idM_r and idMembre = @IdMembre)
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select @idM_r
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+--------+
| @idM_r |
+--------+
| 56 |
+--------+
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COMMIT
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SET AUTOCOMMIT = 1
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