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create table emails (id int, mail nvarchar(40)); insert into emails values (01,'dave.green@mail.com'), (02,'joe.smith@mail.com'), (03,'dave.green@mail.com'), (04,'annie.white@mail.com'), (05,'alice.inc@mail.com'), (06,'ralph.lauren@mail.com');
6 rows affected
SELECT id, mail FROM ( select *, count(id) over (partition by mail) rows from emails ) t WHERE rows > 1 order by id
id
mail
1
dave.green@mail.com
3
dave.green@mail.com