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Hackerrank | MySQL | Weather Observation Station 4 본문
Weather Observation Station 4
Weather Observation Station 4 | HackerRank
Find the number of duplicate CITY names in STATION.
www.hackerrank.com
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:
Solution
SELECT COUNT(city) - COUNT(DISTINCT(city))
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