mysql - How to select all the unique gmail emails from a set of emails? -

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i noticed gmail doesn't care if . exists in email or not, means ex.ample@gmail.com equivalent exam.ple@gmail.com, nice feature google, pita developers trying maintain list of unique email addresses.

i have table list of emails. exact rules gmail uses detect unique email, , given set of emails, how find actual unique emails?

here's schema:

sql> select * subscribers;  id |     email            ------------------------- 1  | user.name1@gmail.com 2  | username.1@gmail.com 3  | user3@example.net ...

the expected output set of unique (and valid!) emails:

id |     email            ------------------------- 1  | user.name1@gmail.com 3  | user3@example.net

fiddle.

select em, count(*) ( select replace(email, '.','') em subscribers email '%@gmail.com%') t group em having count(*) = 1;

is trying do?

edit: select distinct emails

select distinct  concat(replace(substring(email,1,instr(email,'@')-1),'.',''),            substring(email,instr(email,'@'))) subscribers;

fiddle


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