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´óÖÂÒâ˼Ϊ:select to_date(starttime)-to_date(starttime) from gwlist (Óï¾äÊÇ´íµÄ) ?


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select (to_date(substr(sendtime,1,4)||substr(sendtime,6,2)||substr(sendtime,9,2)||substr(sendtime,12,2)||substr(sendtime,15,2)||'00','yyyyMMddHH24MISS')-to_date(substr(starttime,1,4)||substr(starttime,6,2)||substr(starttime,9,2)||substr(starttime,12,2)||substr(starttime,15,2)||'00','yyyyMMddHH24MISS'))*24*60
from gwlist

SQL code:

select (to_date(substr(sendtime,1,4)||substr(sendtime,6,2)||substr(sendtime,9,2)||substr(sendtime,12,2)||substr(sendtime,15,2)||'00','yyyyMMddHH24MISS')
-to_date(substr(starttime,1,4)||substr(starttime,6,2)||substr(starttime,9,2)||substr(starttime,12,2)||substr(starttime,15,2)||'00','yyyyMMddHH24MISS'))*24*60
from gwlist



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