MAX和MIN加入查詢

-3

SELECT a.price, b.price, a.delivery_hour, a.resource_id, b.delivery_date 
      FROM mms_realtime_dispatch_prices_report AS a 
      INNER JOIN mms_realtime_expost_prices_report AS b 
      ON a.resource_id = b.resource_id 
      AND a.delivery_hour = b.delivery_hour 
      AND a.delivery_date = b.delivery_date 
      WHERE a.delivery_date = '2013-09-21' 
      ORDER BY a.resource_id ASC

這是我的查詢。是否可以添加一個確定價格最大值和最小值的新列？MAX和MIN加入查詢

來源

2013-11-27 Misty

最小和最大依據是什麼？這涉及到分組 - 但基於什麼？另外，它是SQL Server還是MySQL？ – Szymon

根據交貨時間先生在mysql – Misty

SELECT max（a.price），min（b.price）_ <您的查詢的其餘部分> _ .. group by a.delivery_hour，a.resource_id，b.deliverydate –

SELECT MIN(a.price) as MIN_PRICE, MAX(a.price) as MAX_PRICE, b.price, a.delivery_hour, a.resource_id, b.delivery_date 
     FROM mms_realtime_dispatch_prices_report AS a 
     INNER JOIN mms_realtime_expost_prices_report AS b 
     ON a.resource_id = b.resource_id 
     AND a.delivery_hour = b.delivery_hour 
     AND a.delivery_date = b.delivery_date 
     WHERE a.delivery_date = '2013-09-21' 
     GROUP BY b.price, a.delivery_hour, a.resource_id, b.delivery_date 
     ORDER BY a.resource_id ASC

來源

2013-11-27 05:25:48

如果它適合你，你可以通過點擊答案左側的勾號將其標記爲答案;） –

嘗試這樣：

SELECT max(a.price), min(b.price), a.delivery_hour, a.resource_id, b.delivery_date 
     FROM mms_realtime_dispatch_prices_report AS a 
     INNER JOIN mms_realtime_expost_prices_report AS b 
     ON a.resource_id = b.resource_id 
     AND a.delivery_hour = b.delivery_hour 
     AND a.delivery_date = b.delivery_date 
     WHERE a.delivery_date = '2013-09-21' 
     GROUP BY a.delivery_hour, a.resource_id, b.delivery_date 
     ORDER BY a.resource_id ASC

來源

2013-11-27 05:27:05 7alhashmi

是不是與以前的答案相同？ –

@Nadeem_MK nope，檢查'group by'條件。 – 7alhashmi

這是因爲你搞砸了價格，有2個價格檢索，你選擇最低爲1和最高爲其他 –

MAX和MIN加入查詢

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