Database upgrade

Hi, i have an application in old Mendix version 6.4. I need to Update it to Mendix 7.2 . Hoping Mendix will automatically take care of upgrade when i open the applicaiton in new version, i wonder how database is going to respond. I have current postgreSQL database for mendix 6.4 version, now i have to move to it to SQL database and upgrade to latest Mendix version. 1. How do i connnect the new sql database to mendix modeler? 1. WHen i migrate Database to SQL and update the Mendix, will i run into any complatibity issues due to new database platform and update Mendix version?   ANy guidance on this?
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