oracle日期减一秒
select sysdate,sysdate+numtosinterval(1,'second') from dual; 加1秒select sysdate,sysdate-numtosinterval(1,'second') from dual; 减1秒
select sysdate,sysdate+numtosinterval(45,'minute') from dual; 加45分钟
select sysdate,sysdate+numtosinterval(1,'hour') from dual; 加1个小时
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