How to find difference in similar rows?

[JYan01]

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.

[Alex_Combessie]

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

[jereze · Accepted solution]

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.