Linqpad allows you to "Include Additional Databases" if your database is MsSql server. It would be nice if we could do the same for Sqlite databases.

You should be possible to do this using Sqlite's attach database command (see https://sqlite.org/lang_attach.html )

For myself, it was worth asking Claude AI to create a typed datacontext assembly to do this, but there have been other cases where I needed to query two databases for a one-off query, so if this feature was built it into linqpad, it would help.