user: Question: who is the the mens doubles with mens singles being Jürgen Koch and womens singles being Sabine Ploner
Columns: ['Year', 'Mens singles', 'Womens singles', 'Mens doubles', 'Womens doubles', 'Mixed doubles']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1958.0, 'Helmut Kraule', 'Lotte Heri', 'Valentin Taupe August Woschitz', 'Hilde Taupe Anni Taupe', 'Bernd Frohnwieser Hilde Themel']
SQL:

assistant: SELECT "Mens doubles" FROM "Table" WHERE "Mens singles" = 'Jürgen Koch' AND "Womens singles" = 'Sabine Ploner';