Leetcode - 626. Exchange Seats

Indo Yoon -

문제

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정답

SELECT 
CASE
    WHEN id = len AND id % 2 = 1 THEN id
    WHEN id % 2 = 1 THEN id + 1
    ELSE id - 1
END AS id, student
FROM Seat, (
    SELECT COUNT(*) AS len
    FROM Seat
) AS NewSeat
ORDER BY id