How to find difference in similar rows?
JYan01
Registered Posts: 1 ✭✭✭✭
I have a database with a unique ID identifier for each row/record. Rows are created by dates.
For example, say I have 3 rows for borrower #1 for April 1, May 1, and June 1 and their respective rating.
April 1 = A2
May 1 = A1
June 1 = A1
How would I be able to create a column that would identify if the rating has changed from the previous month? So April 1 = no, May 1 = Yes, June 1 = No.
Any help would be appreciated. Thanks.
For example, say I have 3 rows for borrower #1 for April 1, May 1, and June 1 and their respective rating.
April 1 = A2
May 1 = A1
June 1 = A1
How would I be able to create a column that would identify if the rating has changed from the previous month? So April 1 = no, May 1 = Yes, June 1 = No.
Any help would be appreciated. Thanks.
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Best Answer
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If you don't want to code, you have these two recipes that can help you:
- distinct : to make sure that you have a unique row per month per ID
- windows : can help with many things, in particular can help you to retrieve the previous value (LAG) in a partition (so you should partition by ID and sort by lonth). To better understand this recipe, have a look at windows functions from the SQL databases.
I hope that will help.
Answers
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Hello, This is exactly the purpose of the visual window recipe. Here is an explanation of how to use it :
https://youtu.be/3VZIwxZl3vg Cheers, Alexandre
