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sql - Return List of Records where 1 ID is linked to 2 different PKs

First of all, apologies for the title - wasn't sure how to word it.

Essentially I have this data:

ID RuleID AccountID
1 1234 ABC001
2 5678 DEF001
3 1234 GHI001
4 1234 ABC001

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You can try EXISTS as follows:

SELECT * FROM #rules r
where exists 
  (select 1 from #rules rr
    where rr.RuleID = r.RuleID and rr.AccountID <> r.AccountID);

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