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使用 mysql

2 个日期：start_date和end_date。

修改后
TIMEDIFF(start_date, end_date) AS time_diff

我想 SUM() all time_diff 所以我试试这个
SUM(TIMEDIFF(start_date, end_date)) AS time_diff

这会返回我不希望的东西。
我究竟做错了什么？

编辑： SEC_TO_TIME(SUM(TIME_TO_SEC(TIMEDIFF(end_date, START_DATE)))) AS time_diff

完美运行

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2 回答 2

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end_date应该是第一和start_date第二，否则你会得到负值作为输出：

SUM(TIME_DIFF(CAST(end_date AS DATETIME), CAST(start_date AS DATETIME))) AS time_diff
于 2012-08-10T09:56:26.487 回答
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SEC_TO_TIME(SUM(TIME_TO_SEC(TIMEDIFF(end_date, START_DATE)))) AS time_diff

于 2012-08-10T10:10:09.133 回答