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_16 ( Id VARCHAR )

### Question ###
Which 2008 had a 1998 and 2006 that were a when 2009 was sf?

### Accurate SQL ###

SELECT 2008 FROM table_name_16 WHERE 1998 = "a" AND 2009 = "sf" AND 2006 = "a"