Hi Melissa Poveda,
We can have access to mendix database when the app is running.
Click on console tab → Advanced → start built-in database viewer
Please let me know if this was usefull
In addition to Nicole’s answer…
The database your local application uses is specified in the Project → Settings → Configurations → (active configuration setting) → Database.
If you are using the Built-in database, follow the instructions Nicole gave. If you are using a different local database, the connection settings will be here.
It’s really not advisable to attempt to change the database from SQL as it’s managed by Mendix and you may end up breaking your application.
What sort of changes are you planning on making and why do you need to make them. We may be able to suggest a better approach.
Hope this helps.