Informix 日期时间：如何减去 15 分钟

Question

如何在 IBM Informix 中执行此 MySQL 语句？

select type, channel, teilnr, starttime, endtime, usedtime, host 
from online_time 
where starttime < DATE_SUB(NOW(),INTERVAL 15 MINUTE)
order by starttime desc 

我在 Informix 中试过这个，但它给出了语法错误。

select type, channel, teilnr, starttime, endtime, usedtime, host 
from online_time 
where starttime < subdate(CURRENT, INTERVAL "15" MINUTES)
order by starttime desc 

Answer 1

select type, channel, teilnr, starttime, endtime, usedtime, host 
from online_time 
where starttime > (CURRENT - 15 UNITS MINUTE) 
order by starttime desc