Symmetric Pairs MediumSQL (Intermediate) – HackerRank Solution SQL, Best and Optimal Solutions , All you need.
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SQL Symmetric Pairs MediumSQL (Intermediate) HackerRank Solution
WITH NumberedPairs (R, X, Y)
AS
(
SELECT ROW_NUMBER() OVER (ORDER BY X) AS R,
X, Y FROM Functions
)
SELECT
DISTINCT X,
(SELECT X FROM NumberedPairs WHERE FOuter.X = Y AND X = FOuter.Y AND R <> FOuter.R)
FROM NumberedPairs AS FOuter
WHERE
EXISTS(SELECT Y FROM NumberedPairs WHERE FOuter.X = Y AND X = FOuter.Y AND R <> FOuter.R) AND
X <= (SELECT X FROM NumberedPairs WHERE FOuter.X = Y AND X = FOuter.Y AND R <> FOuter.R)
ORDER BY X;
SQL (Basic)
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