user: Question: What Canadian Championship had CONCACAF Champions League of Semifinals?
Columns: ['Year', 'Regular Season', 'Playoffs', 'Canadian Championship', 'CONCACAF Champions League']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['2007', '7th East; 13th Overall', 'Did not qualify', 'Began in 2008', 'Began in 2008']
SQL:

assistant: SELECT "Canadian Championship" FROM "Table" WHERE "CONCACAF Champions League" = 'Semifinals';