Group list a equal b

Lists-Logic
1

I hope you understand my problem.
I would like to group the windows in the same way as the rooms. But I can’t do it and I don’t know where my thinking error is.

1_2019-12-02_04-43-07
1_2019-12-02_04-43-071418×856 52.3 KB

2

Use GroupByKey instead of GroupByFunction. You’ll have to get the id of the rooms but then you can use that value (key) to sort both the rooms and the windows.

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