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| --------------
START TRANSACTION
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--------------
set session collation_connection = "latin1_general_ci"
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--------------
DROP DATABASE IF EXISTS `base`
--------------
--------------
CREATE DATABASE IF NOT EXISTS `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,
`email` varchar(255) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
--------------
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INSERT INTO `test` (`email`) VALUES
('jean.du.pont@gmail.com'),
('jean.du.pont@outlook.com'),
('j.e.a.n.d.u.p.o.n.t@gmail.com'),
('je.an.du.po.nt@gmail.com'),
('jean-du-pont@gmail.com'),
('jean.du.pond@gmail.com'),
('jean.du.pond@outlook.com'),
('j.e.a.n.d.u.p.o.n.d@gmail.com'),
('jea.ndu.po.n.d@gmail.com'),
('je.an.du.po.nd@gmail.com'),
('jean-du-pond@gmail.com')
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select * from `test`
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+----+-------------------------------+
| id | email |
+----+-------------------------------+
| 1 | jean.du.pont@gmail.com |
| 2 | jean.du.pont@outlook.com |
| 3 | j.e.a.n.d.u.p.o.n.t@gmail.com |
| 4 | je.an.du.po.nt@gmail.com |
| 5 | jean-du-pont@gmail.com |
| 6 | jean.du.pond@gmail.com |
| 7 | jean.du.pond@outlook.com |
| 8 | j.e.a.n.d.u.p.o.n.d@gmail.com |
| 9 | jea.ndu.po.n.d@gmail.com |
| 10 | je.an.du.po.nd@gmail.com |
| 11 | jean-du-pond@gmail.com |
+----+-------------------------------+
--------------
drop view if exists `vue`
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create view `vue` as
select id,
replace(`email`,'.','') as test
from `test`
where email like '%@gmail.com'
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select * from `vue`
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+----+-----------------------+
| id | test |
+----+-----------------------+
| 1 | jeandupont@gmailcom |
| 3 | jeandupont@gmailcom |
| 4 | jeandupont@gmailcom |
| 5 | jean-du-pont@gmailcom |
| 6 | jeandupond@gmailcom |
| 8 | jeandupond@gmailcom |
| 9 | jeandupond@gmailcom |
| 10 | jeandupond@gmailcom |
| 11 | jean-du-pond@gmailcom |
+----+-----------------------+
--------------
select t1.id,
t1.test
from `vue` as t1
inner join ( select test
from `vue`
group by test
having count(test) > 1
) as t2
on t2.test = t1.test
--------------
+----+---------------------+
| id | test |
+----+---------------------+
| 1 | jeandupont@gmailcom |
| 3 | jeandupont@gmailcom |
| 4 | jeandupont@gmailcom |
| 6 | jeandupond@gmailcom |
| 8 | jeandupond@gmailcom |
| 9 | jeandupond@gmailcom |
| 10 | jeandupond@gmailcom |
+----+---------------------+
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COMMIT
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