不好意思，这个题目并没有一个固定的答案。因为一天的时间长度是固定的，而秒钟的计量单位也是固定的，所以一天有24小时 x 60分钟 x 60秒 = 86400秒。但是如果我们考虑闰秒的存在，那么就得看具体的年份和当年是否有闰秒的增加了。所以，答案可能是86400秒，也可能是86401秒或者86402秒，甚至更多。
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SELECT `id`,`topic` FROM `tool_brainteaser` WHERE `id` < 16677 AND `switch` = 1 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000336s ]
SELECT `id`,`topic` FROM `tool_brainteaser` WHERE `id` > 16677 AND `switch` = 1 ORDER BY `id` LIMIT 1 [ RunTime:0.000740s ]
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