I am currently trying to combine Left join with window function (e.g. partition by class_id order by date_to desc) to solve the following problem in SQL. It is quite a difficult problem due to a bunch of tricky constraints that come into play, and it seems to me I need to have a way to choose which rows from the

# Tag: partition-by

## Return last year value with last_value function in SQL

I need to return the last value of the last date of the year. the problem is that the last value that already comes in SQL is being returned. Product Date Value Last_Value_Previous_Year Prod A 31/12/2020 5000.00 2000.00 Prod A 01/01/2020 2000.00 2000.00 Prod A 01/01/2021 1000.00 3000.00 Prod A 01/02/2021 1500.00 3000.00 Prod A 01/03/2021 1000.00 3000.00 Prod A

## Displaying Unique Temperature Values for the US

I am looking to do something similar to what I did in R (below) in SQL: The output of this code looks like this: So far in SQL I have managed to output a single state using the following code: The output looks like this: However, I am unable to get the unique avgTemp for each state. When I take

## SQL to get 3 adjacent actions without duplicate from the flags

I have a question that a little bit similar with question#66044663 but more complicated. Here’s my dummy data. I want to get 3 adjacent actions(no duplicate) from the flag by each user. Here’s the …

## SQL SUM OVER PARTITION BY 2 columns not working

Common question, I know. Just haven’t been able to find a solution to my question, so hit me with the removal and or downvotes if you must. (Oracle 12c) I have data that looks like this: Date …