TIME_TO_SEC(end_time)-TIME_TO_SEC(start_time) 与HOUR函数得到的结果都不全正确
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#两日期/时间之间相差的天数:
To_Days(end_time)-To_Days(start_time)
#两日期/时间之间相差的秒数:
SELECT UNIX_TIMESTAMP(end_time)- UNIX_TIMESTAMP(start_time);
#两日期/时间之间相差的时分数:
SELECT SEC_TO_TIME(UNIX_TIMESTAMP(end_time)- UNIX_TIMESTAMP(start_time));