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_82 (overall VARCHAR, college VARCHAR, position VARCHAR)

### Question ###
What was the overall draft pick of the player who was a db and attended college in iowa?

### Accurate SQL ###

SELECT overall FROM table_name_82 WHERE college = "iowa" AND position = "db"