trunc (sysdate, 'yyyy-mm -dd hh24: mi') is to take the current system time.
+1/24 is plus one hour.
So
sysdate + 1 plus one day
sysdate + 1/24 was added 1 hour
sysdate + 1 / (24 * 60 ) plus one minute
sysdate + 1 / (24 * 60 * 60) plus 1 sec
oracle system time plus one second, one minute, one hour, one day
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Origin blog.csdn.net/zhu_nana/article/details/84746551
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