[英]Join query with multiple same column in one row
我要做這個
這是我的查詢
SELECT
modules.nama_module,
seats.from_seat,
seats.until_seat,
seats.available,
seats.id_seat
FROM `modules`
RIGHT JOIN `seats` ON modules.id_module = seats.id_module
WHERE seats.id_day=1 OR seats.id_day=2
我該怎么做?
嘗試這個。 請注意,我創建了兩列,一列列出了逗號分隔的seat_id,另一列顯示了座位數。 座位數就是創建屏幕快照中顯示的視圖所需的全部,但是我保留seat_ids的輸出類似於您的建議:
SELECT
modules.nama_module,
seats.from_seat,
seats.until_seat,
seats.available,
GROUP_CONCAT(seats.id_seat) as seat_ids,
COUNT(seats.id_seats) as seats_count
FROM `modules`
RIGHT JOIN `seats` ON modules.id_module = seats.id_module
WHERE seats.id_day=1 OR seats.id_day=2
GROUP BY modules.nama_module, seats.from_seat, seats.until_seat
為每個新的seat_id創建新列都有其自身的問題。 創建列名,笨拙的查詢等。
[編輯:]剛剛將nama_module列添加到GROUP BY,因為我意識到不同服務的時間可能會重疊(是嗎?)
您的查詢中缺少分組依據和總和
SELECT
modules.nama_module,
seats.from_seat,
seats.until_seat,
seats.available,
seats.id_seat,
sum(seats.id_seat) as nb_seat_available
FROM `modules`
RIGHT JOIN `seats` ON modules.id_module = seats.id_module
WHERE seats.id_day=1 OR seats.id_day=2
GROUP BY seats.from_seat
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