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In the context of a database containing a 'station' table, there may be a need to identify the number of duplicate city entries. This is a common problem in data cleaning and preprocessing, where duplicate entries can skew analysis and results.
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The solution approach is to use the SQL 'count' function twice. The first 'count' function counts the total number of city entries in the 'station' table. The second 'count' function, combined with 'distinct', counts the number of unique city entries. By subtracting the count of unique cities from the total count, we get the number of duplicate city entries.
select count(city) - count(distinct city) from station;
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