From Xojo Documentation
| This item was deprecated in version 2019r2.
Please use SQLiteDatabase.AddDatabase as a replacement.
Attaches the SQLite database referred to by file to the database. It gives the newly attached database the name databaseName.
When a database has been attached, it is possible to do cross-database queries. In order to attach an encrypted database, you must pass the correct password for the database to be attached.
You should prefix all SQL queries to tables in the attached database with the databaseName.