Have I interacted with this user before? (I.e., answered their question or commented on a post.)
Q&A for programmers
SELECT 'Answer' AS Type, q.Id AS [Post Link], NULL AS [Comment Link], a.CreationDate AS Date FROM Posts a, Posts q WHERE a.ParentId = q.Id AND a.PostTypeId = 2 AND a.OwnerUserId = ##UserId:int## AND q.OwnerUserId = ##TargetUserId:int## UNION ALL SELECT 'Comment' AS Type, c.PostId AS [Post Link], c.Id AS [Comment Link], c.CreationDate AS Date FROM Comments c, Posts p WHERE c.PostId = p.Id AND c.UserId = ##UserId:int## AND p.OwnerUserId = ##TargetUserId:int## ORDER BY Date ASC
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