Hi @ArunRaaman
I think it depends on the actual data structure. When your data is level down , you don't need to use adjacent group. For example: grade->class->student->course->score
Adjacent group is only required when your groups are parallel.
For example you have a lot of product sales records,when you want to calculate the total sells by YEAR or by Region, then you can create adjacent group.
Here is a video ,you can take a reference:https://www.bing.com/videos/search?q=adjacent+groups&docid=608029835887274195&mid=354A0CF0BC2D72376ED1354A0CF0BC2D72376ED1&view=detail&FORM=VIRE
Best Regards,
Isabella
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