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。
SHOW FULL COLUMNS FROM `tool_brainteaser` [ RunTime:0.001560s ]
SELECT `id`,`topic`,`answer` FROM `tool_brainteaser` WHERE `switch` = 1 AND `id` = 9800 LIMIT 1 [ RunTime:0.000315s ]
UPDATE `tool_brainteaser` SET `views` = `views` + 1 WHERE `id` = 9800 [ RunTime:0.002385s ]
SELECT `id`,`topic`,`answer` FROM `tool_brainteaser` WHERE `id` IN (9104,14757,14652,2689,6363,10686,13851,2750,19644,4647,16256,12044,3502,1376,10140,13380,9456,530,2626,11394,3304,16746,18511,5870) AND `switch` = 1 ORDER BY `id` DESC [ RunTime:0.002937s ]
SELECT `id`,`topic` FROM `tool_brainteaser` WHERE `id` < 9800 AND `switch` = 1 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000305s ]
SELECT `id`,`topic` FROM `tool_brainteaser` WHERE `id` > 9800 AND `switch` = 1 ORDER BY `id` LIMIT 1 [ RunTime:0.004605s ]
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