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') subtract1year from dual
Oracle-numtodsinterval&numtoyminterval
原文：http://blog.csdn.net/jxzkin/article/details/42077449