Problem: 626. 换座位

👨‍🏫 参考题解

Code

SELECT(CASEWHEN MOD(id, 2) != 0 AND counts != id THEN id + 1WHEN MOD(id, 2) != 0 AND counts = id THEN idELSE id - 1END) AS id,student
FROMseat,(SELECTCOUNT(*) AS countsFROMseat) AS seat_counts
ORDER BY id ASC;