How to get last date

Hi, I am new here!

I have a dataset that has data on multiple rows for the same patient with different encounter dates. I want to only see the unique patient once (so patient ID is the identifier) and show me only the most recent encounter date. Example data:

John Doe, Patient ID 1, encounter date 1/3/2022

John Doe, Patient ID 1, encounter date 3/5/2022

Jane Doe, Patient ID 3, encounter date 10/1/2022

John Smith, Patient ID 2, encounter date 3/1/2022

John Smith, Patient ID 2, encounter date 1/5/2022

John Smith, Patient ID 2, encounter date 6/4/2022

I have tried grouping methods in ETL and that hasn't worked. Can someone please help me?

Best Answers

  • GrantSmith
    GrantSmith Indiana 🥷
    Answer ✓

    Use a group by tile to group on the name / ID and then take the maximum of your date field.

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  • MarkSnodgrass
    MarkSnodgrass Portland, Oregon 🥷
    Answer ✓

    @ageibe You can do this with the Group By tile in Magic ETL.

    In section #1 (select what columns identify the grouping) put your name and patient Id columns in that section.

    In section #2 enter the name you want to give the most recent date column

    In section #3 choose the encounter date column and then choose maximum for the aggregation type.

    This will give you the most recent encounter date for each patient.

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  • You guys are awesome! I was doing that but apparently I was missing a step. I was able to get exactly what I needed!