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, because
total number of records – number of unique city names = 3-2=1
Weather Observation Station 4 HackerRank Solution SQL
SELECT COUNT(CITY)-COUNT(DISTINCT CITY) FROM STATION;