Evernox supports BigQuery Schema Migrations as well as other formats

1. Create a new Diagram

2. Connect to your Database

3. Import the Database

4. Edit your Schema (you can do that directly in the diagram)

5. When you are finished click on Generate Migration

   You can directly Execute and run the Migration Script in Evernox

Here is the full Guide:

https://www.evernox.com/generate-sql-migrations/