Oracle-numtodsinterval&numtoyminterval，instrument
select sysdate now,sysdate+numtodsinterval(1,'second') add1second,sysdate+numtodsinterval(1,'minute') add1minute,sysdate+numtodsinterval(1,'hour') add1hour,sysdate+numtodsinterval(1,'day') add1day,sysdate+numtoyminterval(1,'month') add1month,sysdate+numtoyminterval(1,'year') add1year,sysdate+numtodsinterval(-1,'second') subtract1second,sysdate+numtodsinterval(-1,'minute') subtract1minute,sysdate+numtodsinterval(-1,'hour') subtract1hour,sysdate+numtodsinterval(-1,'day') subtract1day,sysdate+numtoyminterval(-1,'month') subtract1month,sysdate+numtoyminterval(-1,'year') subtract1yearfrom dual
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