Import all tables from an Excel sheet at once

[thorsten-reitz]

Right now, when importing an Excel sheet as schema or source data, it is necessary to go through the process once per table in the sheet. To reduce user workload, it would be desirable to be able to import all tables (with default settings, e.g. interpretation of all columns as strings).

[Flaminietta]

Can it be one issue for me? @thorsten-reitz @stempler @florianesser?

[github-actions]

This issue has been automatically marked as stale because it has not had activity in the last 60 days. It will be closed in two weeks if no further activity occurs. Thank you for your contributions.

[florianesser]

Backend functionality was implemented in this commit. UI support still needs to be added.