Tell me the sum of year for extra of junior team competition
CREATE TABLE table_name_31 (year INTEGER, extra VARCHAR)
SELECT SUM(year) FROM table_name_31 WHERE extra = "junior team competition"
### Context: CREATE TABLE table_name_31 (year INTEGER, extra VARCHAR) ### Question: Tell me the sum of year for extra of junior team competition ### Answer: SELECT SUM(year) FROM table_name_31 WHERE extra = "junior team competition"