You can able to do like this also.

select OEORI_Date, OEORI_TimeOrd, OEORI_UpdateDate, OEORI_UpdateTime,

datediff('n',%EXTERNAL OEORI_Date||' '||%EXTERNAL OEORI_TimeOrd,%EXTERNAL OEORI_UpdateDate||' '||%EXTERNAL OEORI_UpdateTime)

from SQLUser.OE_orditem

We need to use the third party software like Dragon Mic.

Congrats to all the winners....