Hi all,
I have data as below, with employees attending conferences over a number of years.
Data:
id Year
1 2017
1 2018
2 2017
2 2018
2 2019
2 2020
3 2019
I have to find the most recent year that the participant attended previously for each year. So, what I need is this:
Result needed:
id Year Previously_attended
1 2017
1 2018 2017
2 2017
2 2018 2017
2 2019 2018
2 2020 2019
3 2019
I can't figure out how to do this and would appreciate help. Thanks in advance for your time and patience.
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