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_68 ( year_joined VARCHAR, school VARCHAR, size VARCHAR, ihsaa_class VARCHAR )

### Question ###
How many years Joined have a Size smaller than 417, and an IHSAA Class of A, and a School of jac-cen-del?

### Accurate SQL ###

SELECT COUNT(year_joined) FROM table_name_68 WHERE size < 417 AND ihsaa_class = "a" AND school = "jac-cen-del"