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For some reason I couldn't get my head around this challenge so here is my rather overcomplicated solution
:-) this is good stuff - we do this particular challenge all the time in real life!
Spoiler
- Bring in the new rows first into the union
- Add a record ID in-case some new rows have same info (e.g. Bob)
- Set the end-dates by using start date of the newer record
- Set the current flag using a unique tool taking only most recent
- Then remove people who have left completely (latest = y; but end-date exists)
- Bring in the new rows first into the union
- Add a record ID in-case some new rows have same info (e.g. Bob)
- Set the end-dates by using start date of the newer record
- Set the current flag using a unique tool taking only most recent
- Then remove people who have left completely (latest = y; but end-date exists)
