user: Question: How many times was the election Joseph W. Byrns, Sr. (D) Unopposed?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Tennessee 1', 'B. Carroll Reece', 'Republican', 1920.0, 'Re-elected', 'B. Carroll Reece (R) 88.0% W. I. Giles (D) 12.0%']
SQL:

assistant: SELECT COUNT("Result") FROM "Table" WHERE "Candidates" = 'Joseph W. Byrns, Sr. (D) Unopposed';