Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_262501_1 (primary_conference_when_joining_the_csfl VARCHAR, joined VARCHAR)

### Question ###
what was the primary conference when joining the csfl for the institution that joined in 2004-05? 

### Accurate SQL ###

SELECT primary_conference_when_joining_the_csfl FROM table_262501_1 WHERE joined = "2004-05"