Hi, @Federico Arturo Ramirez Seidel Welcome to the Microsoft Q&A forum, and thanks for reaching out.
As we understand the ask here is you want to know how to copy data from MySQL to dedicated sqlpool without duplicates.
You can copy data using synapse where you can refer to this document however for duplicates you can use debezium connector for CDC data with Azure DB for MySQL which can help you in the scenario. Steps are shared in the blog here
Hope this document helps.
Please let me know if you need any additional information.
Regards
Geetha