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_29196086_4 ( no_in_season INTEGER, original_air_date VARCHAR )

### Question ###
which episode of the season aired on october20,2012

### Accurate SQL ###

SELECT MAX(no_in_season) FROM table_29196086_4 WHERE original_air_date = "October20,2012"