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select a.*, c.replyCount, b.ReplyerName replyerName, b.CreateTime lastReply, b.Content content
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select a.*, c.replyCount, b.ReplyerName replyerName, b.CreateTime lastReply, b.Content content
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select b.ProblemId, max(b.Id) id from QAReply b GROUP BY b.ProblemId) d on a.Id = d.ProblemId
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select b.ProblemId, max(b.Id) id from QAReply b GROUP BY b.ProblemId) d on a.Id = d.ProblemId
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