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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:
where LAT_N
is the northern latitude and LONG_W
is the western longitude.
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
SELECT COUNT(CITY)- COUNT(DISTINCT CITY)
FROM STATION;