What number episode had a 4.2 rating? 
CREATE TABLE table_23730973_5 (no INTEGER, rating VARCHAR)
SELECT MIN(no) FROM table_23730973_5 WHERE rating = "4.2"
### Context: CREATE TABLE table_23730973_5 (no INTEGER, rating VARCHAR) ### Question: What number episode had a 4.2 rating?  ### Answer: SELECT MIN(no) FROM table_23730973_5 WHERE rating = "4.2"