GitHub user lionants02 added a comment to the discussion: Using Hop to 
transform data and write to another database

For the daily summary data, I use "Select values" in the "Meta-data" tab to 
convert the time field into a "String" in the desired counting format, such as 
"yyyy-MM-dd" in this case. Then I sort this field from smallest to largest 
using "Sort rows" and perform a "Group By sum" using the fields created from 
"yyyy-MM-dd".

This method allows you to adjust the resolution from daily to hourly by 
adjusting the "yyyy-MM-dd HH" format to your desired level.

GitHub link: 
https://github.com/apache/hop/discussions/6308#discussioncomment-15592731

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