HackerRank-BasicSelect-Weather Observation Station 4

Weather Observation Station 4

Find the difference between the total number of CITY entries in the table and the number of distinct CITY entries in the table.
The STATION table is described as follows:

For example, if there are three records in the table with CITY values ‘New York’, ‘New York’, ‘Bengalaru’, there are 2 different city names: ‘New York’ and ‘Bengalaru’. The query returns 1

SELECT COUNT(CITY) - COUNT(DISTINCT CITY)
FROM STATION;