user: Question: what was the primary conference when joining the csfl for the institution that joined in 2004-05? 
Columns: ['Institution', 'Location', 'Founded', 'Type', 'Enrollment', 'Joined', 'Nickname', 'Primary Conference when joining the CSFL']
Types: ['text', 'text', 'real', 'text', 'real', 'text', 'text', 'text']
Sample row: ['Bacone College', 'Muskogee, Oklahoma', 1880.0, 'Private', 900.0, '2002-03', 'Warriors', 'Red River (RRAC)']
SQL:

assistant: SELECT "Primary Conference when joining the CSFL" FROM "Table" WHERE "Joined" = '2004-05';