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 Allergy_Type ( Allergy VARCHAR(20), AllergyType VARCHAR(20) )
TABLE: CREATE TABLE Student ( StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) )
TABLE: CREATE TABLE Has_Allergy ( StuID INTEGER, Allergy VARCHAR(20) )

### Question ###
Return a histogram on how many students live in each city?

### Accurate SQL ###

SELECT city_code, COUNT(*) FROM Student GROUP BY city_code