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_25664518_3 (itv1_weekly_ranking INTEGER, viewers__millions_ VARCHAR)

### Question ###
What is the minimum ITV1 ranking for the episode having viewership of 5.42 million?

### Accurate SQL ###

SELECT MIN(itv1_weekly_ranking) FROM table_25664518_3 WHERE viewers__millions_ = "5.42"