instruction: When were this question's answers upvoted?.
response: SELECT v.CreationDate AS "Vote Date", p.Id AS "Answer ID", p.CreationDate AS "Answer Date", p.Score AS "Answer Score", p.ParentId AS "Question ID", pp.CreationDate AS "Question Date", pp.Title AS "Question Title" FROM Posts AS p JOIN Posts AS pp ON p.ParentId = pp.Id JOIN Votes AS v ON v.PostId = p.Id WHERE pp.Id = 1686