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_28051 ( "Episode no." real, "Airdate" text, "Dave Viewers" real, "Dave Rank" real, "Rank (cable)" real, "Dave ja vu Viewers" real, "Total viewers" real )

### Question ###
Which episode number aired on 18 october 2012?

### Accurate SQL ###

SELECT MIN("Episode no.") FROM table_28051 WHERE "Airdate" = '18 October 2012'