user: Question: Which sport was held in Huntsville at the Von Braun Center as part of the Southern Indoor Football League?
Columns: ['Club', 'City', 'Sport', 'League', 'Venue']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Dixie Derby Girls', 'Huntsville', 'Roller derby', "Women's Flat Track Derby Association ( WFTDA )", 'Von Braun Center']
SQL:

assistant: SELECT "Sport" FROM "Table" WHERE "City" = 'Huntsville' AND "Venue" = 'Von Braun Center' AND "League" = 'Southern Indoor Football League';