sql - How to trim emails in a column and at the same time remove duplicates (MSQL2017, UPDATE column) -

i have table data 1 of them emails stored in column called "domain".

i need update "domain" cut emails , leave domains (example: test@testmail.com after query testmail.com).

so domain column has on 290000 emails stored inside , there null's...
said looking domains , don't need data left of , including @
don't need duplicated domain list or null values in domain column.

so looking query trim emails transform them domains @ same time query remove data null value , duplicated domains.

the final result should column domain unique domains , without nulls inside.

as simple as:

select distinct right(email, len(email) - charindex('@', email)) email_domain table email not null;