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_name_15 ( ihsaa_class VARCHAR, year_joined VARCHAR )

### Question ###
What is the IHSAA Class for football for the team joining in 1968?

### Accurate SQL ###

SELECT ihsaa_class AS Football FROM table_name_15 WHERE year_joined = 1968