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_3042 ( "Episode no." real, "Airdate" text, "Viewers" real, "BBC Three weekly ranking" real, "Cable rank" real )

### Question ###
What is the highest cable ranking?

### Accurate SQL ###

SELECT MAX("Cable rank") FROM table_3042