Question

Assume I have a table entries with columns: id, alias_one, alias_two, name.

How do I select all values from entries where there exists several names for the same alias_one / alias_two pairs provided that names are not known?

Looks like as an option, group by alias_one and alias_two can be used but somehow it fails.

Answer 1

It will return all table rows for which there’s another row with the same alias_one and alias_two but different name.

select
  id,
  alias_one,
  alias_two,
  name
from
  (
  select
    id,
    alias_one,
    alias_two,
    name,
    count (distinct name) over (partition by alias_one, alias_two) as cnt
  from entries
  )
where cnt > 1