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Weather Observation Station 20 MediumSQL (Intermediate) – HackerRank Solution SQL, Best and Optimal Solutions , All you need.
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SQL Weather Observation Station 20 MediumSQL (Intermediate) HackerRank Solution
/*
Enter your query here.
Please append a semicolon ";" at the end of the query and enter your query in a single line to avoid error.
*/
SELECT CAST( AVG(1.0 * LAT_N) AS NUMERIC(20,4))
FROM
(
SELECT LAT_N,
ra = ROW_NUMBER() OVER (ORDER BY LAT_N, id),
rd = ROW_NUMBER() OVER (ORDER BY LAT_N DESC, id DESC)
FROM STATION
) AS x
WHERE ra BETWEEN rd - 1 AND rd + 1;
SQL (Basic)
SQL (Intermediate)
SQL (Advanced)
Basic Select
Advanced Select
Aggregation
Basic Join
Advanced Join
Alternative Queries
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