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 city ( City_ID int, Official_Name text, Status text, Area_km_2 real, Population real, Census_Ranking text )
TABLE: CREATE TABLE farm_competition ( Competition_ID int, Year int, Theme text, Host_city_ID int, Hosts text )
TABLE: CREATE TABLE farm ( Farm_ID int, Year int, Total_Horses real, Working_Horses real, Total_Cattle real, Oxen real, Bulls real, Cows real, Pigs real, Sheep_and_Goats real )
TABLE: CREATE TABLE competition_record ( Competition_ID int, Farm_ID int, Rank int )

### Question ###
How many competitions are held in each city? Draw a pie chart.

### Accurate SQL ###

SELECT Official_Name, COUNT(Official_Name) FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID GROUP BY Official_Name