Transforming source columns to create unique destination column in SSIS -


i have been building ssis package transfers data between 2 databases different schemas. in destination database 1 column has unique key constraint, , data needs populated 2 source database columns like:

select (lower(left(col1.column1, 5)) + lower(left(col1.column2, 5))) 

i.e. first 5 characters each column, plus incrementing number @ end if there duplicates.

the incrementing number has dependent on first 10 characters every different variation has own incrementing number. ex:

dest.column
apapapap1
apapapap2
apapapap3
epepepep1
epepepep2

this package run every week, adding necessary column ssis oledb source won't work.

so question is: possible carry out transformation in ssis before writing destination database, , if so, how?

doing using custom query preferred option here if have in ssis, try generating 2 columns in ssis, 1 appends 2 columns source (source1), , contains these combinations destination (after removing number) (dest1). can configure lookup block , count number of entries in dest1 column corresponding each entry in source1 , appending (this number +1) end of source1.


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