user: Question: Which Holmenkollen has a Country of Norway, and a Winner of Tom Sandberg?
Columns: ['Winner', 'Country', 'Winter Olympics', 'FIS Nordic World Ski Championships', 'Holmenkollen']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Thorleif Haug', 'Norway', '1924', '1924', '1919, 1920, 1921']
SQL:

assistant: SELECT "Holmenkollen" FROM "Table" WHERE "Country" = 'Norway' AND "Winner" = 'Tom Sandberg';