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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 `user`
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CREATE TABLE `user`
( `id` integer unsigned NOT NULL primary key,
`email` char(20) NOT NULL,
`nom` char(04) NOT NULL,
index `idx_1` (`email`)
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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INSERT INTO `user` (`id`, `email`, `nom`) VALUES
( 1, 'aaaa@mail.com', 'tata'),
( 4, 'aaaa@mail.com', 'toto'),
( 8, 'aaaa@mail.com', 'tutu'),
( 101, 'bbbb@mail.com', 'bobo'),
(1012, 'aaaa@mail.com', 'titi')
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select * from `user`
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+------+---------------+------+
| id | email | nom |
+------+---------------+------+
| 1 | aaaa@mail.com | tata |
| 4 | aaaa@mail.com | toto |
| 8 | aaaa@mail.com | tutu |
| 101 | bbbb@mail.com | bobo |
| 1012 | aaaa@mail.com | titi |
+------+---------------+------+
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DROP TABLE IF EXISTS `no_doublon`
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CREATE TABLE `no_doublon`
( `clef` integer unsigned NOT NULL,
`exclusion` integer unsigned NOT NULL,
primary key (`clef`,`exclusion`),
index `idx_2` (`exclusion`)
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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INSERT INTO `no_doublon` (`clef`,`exclusion`) VALUES
(1, 8),
(1, 1012)
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select * from `no_doublon`
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+------+-----------+
| clef | exclusion |
+------+-----------+
| 1 | 8 |
| 1 | 1012 |
+------+-----------+
--------------
select email,
count(*) as nbre,
group_concat(id order by `id`) as ids
from `user`
group by email
having nbre > 1
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+---------------+------+------------+
| email | nbre | ids |
+---------------+------+------------+
| aaaa@mail.com | 4 | 1,4,8,1012 |
+---------------+------+------------+
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select t2.email,
group_concat(t2.id order by t2.id) as ids
from ( select email,
count(*) as nbre
from `user`
group by email
having nbre > 1
) as t1
inner join `user` as t2
on t2.email = t1.email
where not exists ( select 1
from `no_doublon`as t3
where t3.exclusion = t2.id
and exists ( select 1
from `user` as t4
where t4.email = t1.email
and t4.id = t3.clef
)
)
group by email
order by email
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+---------------+------+
| email | ids |
+---------------+------+
| aaaa@mail.com | 1,4 |
+---------------+------+
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COMMIT
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SET AUTOCOMMIT = 1
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