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if all data to aggregate are in the same database, the best way is to aggregate inside the database.
You can use your SQL query, or use the tELTAggregate component in Talend (ELT family)
I have a composant TJDBC input with a SQL request. I would like agregate some data. What is the best, used the agregate avg in my sql request or used the componant tagregate in Talend ?