Weather Observation Station 4

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    select count(city)- count(distinct city) from station

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    select count(city) - count(distinct city) as D from station ;

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    SELECT COUNT(*) - COUNT(DISTINCT city) AS difference FROM station;

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    SELECT COUNT(CITY) - COUNT(DISTINCT CITY) AS difference FROM station

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    SELECT COUNT(CITY) - COUNT(DISTINCT CITY) AS difference FROM station;