I am working on an Odoo 11 project and unfortunately, we can't migrate to Odoo 12.
Reading the book [Odoo 12 Development Cookbook - Third Edition][1] I found a way to create my aggregate method WITHOUT coding `SQL` with `GROUP BY`, just using the `read_group` method available on Odoo API.
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2027
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Because I can't edit the question here, I made it also on StackOverflow with a better context
https://stackoverflow.com/questions/69148517/does-the-orm-read-group-on-odoo-11-has-the-same-features-of-odoo-12