I'm trying to refactor a poor DB design that has resulted in many duplicate rows. (about 80,000 rows out of 190,000 rows are dupes.
I understand how to delete the duplicates, but I am unsure how to propogate the PK of the rows I keep to children of the duplicates, IOW I'm trying to map 1 onto many.

Am I making any sense?

Thanks for any ideas.