场景:您制作了一个出色的脚本,用户可以在其中为图像投票,但您没有在 POST 上设置故障保护,这意味着一些用户最终会通过刷新浏览器来一次性为图像多次投票.
问题:您现在必须清理表格以减少投票,以便它们至少间隔 1 小时。例如:
photo_id voter_id date_vote
54321 123 28th june 2011 16h46 57s
54321 123 28th june 2011 16h47 12s <= delete
54321 123 28th june 2011 16h47 35s <= delete
54321 123 28th june 2011 16h47 52s <= delete
54321 123 28th june 2011 16h48 22s <= delete
...
54321 123 28th june 2011 17h47 05s <= keep
这可以通过一个查询还是连续查询的组合来实现?