I have to process few flat files to insert their data in one table in one database. But there is one particular column (LastPromotionDate) that may exist in few of the files but not in all. Now for files where it is existing, its value is to be inserted in corresponding column LastPromotionDate in the destination table. But for files where it is not existing, I have to use some variable value as input to the corresponding column LastPromotionDate in the destination table. Is it possible? If YES then how, which type of transformation to be used and how?