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_20458 ( "Game" real, "Date" text, "Opponent" text, "Result" text, "Oilers points" real, "Opponents" real, "Oilers first downs" real, "Record" text, "Attendance" real )

### Question ###
On Sept. 17, how many first downs did the oilers have?

### Accurate SQL ###

SELECT COUNT("Oilers first downs") FROM table_20458 WHERE "Date" = 'Sept. 17'