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 storm ( Storm_ID int, Name text, Dates_active text, Max_speed int, Damage_millions_USD real, Number_Deaths int )
TABLE: CREATE TABLE region ( Region_id int, Region_code text, Region_name text )
TABLE: CREATE TABLE affected_region ( Region_id int, Storm_ID int, Number_city_affected real )

### Question ###
A pie chart about how many regions were affected by each storm?

### Accurate SQL ###

SELECT Name, COUNT(*) FROM storm AS T1 JOIN affected_region AS T2 ON T1.Storm_ID = T2.Storm_ID GROUP BY T1.Storm_ID