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_1963459_2 (average_speed__mph_ VARCHAR, driver VARCHAR)

### Question ###
What is Tony Stewart's average speed?

### Accurate SQL ###

SELECT average_speed__mph_ FROM table_1963459_2 WHERE driver = "Tony Stewart"