user: Question: What is the earliest year Borussia Dortmund was west and BFC Viktoria 1889 was Berlin?
Columns: ['Year', 'Nord', 'West', 'Südwest', 'Berlin']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1946.0, '–', '–', '1. FC Saarbrücken', 'SG Wilmersdorf']
SQL:

assistant: SELECT MIN("Year") FROM "Table" WHERE "West" = 'Borussia Dortmund' AND "Berlin" = 'BFC Viktoria 1889';