I'm looking for some sort of app, tool, macro or other that would let me convert an Access db into a mySQL database.
You can use AccessDUMP, that converts the Access DB into a usable SQL schema dump. AccessDUMP is a free GUI-based application, and can be downloaded here:
Once you have converted the Access database to an SQL schema file, then you can use phpMyAdmin to upload the file, using the "Run SQL query/queries on database - textfile" feature on your phpMyAdmin database table listing page.
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