查询列表链表加排序 每次刷新顺序都不同是什么情况？

    $list = DB::select("select summaries.id,summaries.created_at,dye_summaries.updated_at,dye_summaries.updator_id from summaries  left join   dye_summaries   on TYPE=1 and summaries.id=summaries_id  WHERE `dye_summary_status` = '1' ORDER BY summaries.created_at desc,dye_summaries.updated_at desc ");

查询结果刷新顺序会变？有人知道怎么回事吗？

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