Hello,
This is an English spoken forum, so please post your question in English.
Welche zusätzlichen Kommandos gibt es unter SQL 2019 im Gegensatz zu SQL 2016.
See https://learn.microsoft.com/en-us/sql/database-engine/install-windows/install-sql-server-from-the-command-prompt?view=sql-server-ver15 for all existing parameters.
Welche externen Datenquellen sind hiermit gemeint?
Do you mean this type of "External Datasources"?
https://learn.microsoft.com/en-us/sql/t-sql/statements/create-external-data-source-transact-sql?view=sql-server-ver15&tabs=dedicated