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 locations ( country_id VARCHAR )

### Question ###
display the country ID and number of cities for each country.

### Accurate SQL ###

SELECT country_id, COUNT(*) FROM locations GROUP BY country_id