按日期類型字符串排序在SQL Server 2012中

Question

我有一個SQL查詢，其中我檢索一些數據使用JOINS也有DateTime字段Delivery，但雖然檢索我將它轉換爲字符串的格式MMM YYYY但在最後我想按Delivery對整個列表進行排序，但是當我將該列轉換爲字符串時，我不確定如何按原始DateTime字段Delivery排序結果。我的查詢如下

WITH deliveryProducts AS 
(
    SELECT DISTINCT FORMAT(a.Delivery,'MMMM yyyy') AS Delivery, b.Product 
    FROM DEALS as a, PRODUCTS as b Where a.TradeDate<=@tradeEndDate 
) 
, deliveryActuals AS 
(
    SELECT 
      FORMAT(a.Delivery,'MMMM yyyy') AS Delivery, 

      b.Product,COUNT(a.Id) AS Trades, 
      ((6.2898*SUM(a.Volume))/DAY(EOMONTH(DATEADD(MONTH, DATEDIFF(MONTH, 0,a.Delivery), 0))))*0.001 AS BBLperDay, 
      SUM(a.Volume) AS M3, 

     SUM(a.Volume*a.Price)/Sum(a.Volume) AS WeightedAverage 
FROM  Deals AS a right outer join Products AS b 
      ON a.Product=b.Product AND 
      a.TradeDate<=@tradeEndDate 
GROUP BY b.Product, 

      DATEADD(MONTH, DATEDIFF(MONTH, 0,a.Delivery),0), FORMAT(a.Delivery,'MMMM yyyy') 

) 

SELECT 
    dp.Delivery, dp.Product, trades, BBLperDay, M3, WeightedAverage 
FROM 
    deliveryProducts dp 

    LEFT JOIN deliveryActuals da 
    on dp.Delivery = da.Delivery 
    and dp.product = da.Product 

ORDER BY dp.Delivery,dp.Product 

上述查詢給我所需要的數據，但通過種種作爲Delivery一個string。

我可以知道一個更好的方法來解決這個問題嗎？

Answer 1

ORDER BY cast(dp.Delivery as date), dp.Product 

SQL Server可以處理鑄造字符串「MMMM YYYY」或「MMM YYYY」來日期或日期時間。

Answer 2

您可以通過月份和年份爲整數組，然後格式化在結束日期：

WITH deliveryProducts AS 
(
    SELECT MONTH(a.Delivery) AS DeliveryMonth, 
      YEAR(a.Delivery) AS DeliveryYear, 
      b.Product 
    FROM DEALS as a, PRODUCTS as b 
    WHERE a.TradeDate <= @tradeEndDate 
) 
, deliveryActuals AS 
(
    SELECT MONTH(a.Delivery) AS DeliveryMonth, 
      YEAR(a.Delivery) AS DeliveryYear, 
      b.Product,COUNT(a.Id) AS Trades, 
      ((6.2898*SUM(a.Volume))/DAY(EOMONTH(DATEADD(MONTH, DATEDIFF(MONTH, 0,a.Delivery), 0))))*0.001 AS BBLperDay, 
      SUM(a.Volume) AS M3, 

     SUM(a.Volume*a.Price)/Sum(a.Volume) AS WeightedAverage 
FROM  Deals AS a right outer join Products AS b 
      ON a.Product=b.Product AND 
      a.TradeDate<=@tradeEndDate 
GROUP BY b.Product, 
      MONTH(a.Delivery), 
      YEAR(a.Delivery) 

) 

SELECT 
    FORMAT(
     CAST(CAST(dp.DeliveryYear AS VARCHAR(4)) + 
    RIGHT('0' + CAST(dp.DeliveryMonth AS VARCHAR(2)), 2) + 
    RIGHT('0' + CAST(1 AS VARCHAR(2)), 2) 
AS DATETIME), 'MMMM yyyy'), 
    dp.Product, trades, BBLperDay, M3, WeightedAverage 
FROM 
    deliveryProducts dp 

    LEFT JOIN deliveryActuals da 
    on dp.DeliveryMonth = da.DeliveryMonth 
    and dp.DeliveryYear = da.DeliveryYear 
    and dp.product = da.Product 

ORDER BY dp.DeliveryYear, dp.DeliveryYear, dp.Product