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_17525955_2 ( rating VARCHAR, us_air_date VARCHAR )

### Question ###
How many rating/share values does the episode aired on Saturday, May 9, 2009?

### Accurate SQL ###

SELECT COUNT(rating) / SHARE(18 AS –49) FROM table_17525955_2 WHERE us_air_date = "Saturday, May 9, 2009"