在何處條款中使用案例日期

Question

我目前有這WHERE子句，其中包括以下參數。

WHERE 
    Project ID=110 
    AND ((CAST(saa.Date AS DATE) >= '09/24/2014' AND CAST(saa.Date AS DATE) <= '09/24/2014') OR saa.Date IS NULL)) 

這裏最棘手的部分是，saa.Date is NULL部分要拉的所有Null值在所有的時間（這是過度），我只是想用下面的日期範圍Null值

(
     (CAST(sa.StartDateTime AS DATE) >= '09/24/2014' AND CAST(sa.StartDateTime AS DATE) <= '09/24/2014') 
     OR 
     (CAST(sa.EndDateTime AS DATE) >= '09/24/2014' AND CAST(sa.EndDateTime AS DATE) <= '09/24/2014') 
) 

所以我試圖找出如何創建一個CASE聲明，將工作，這將是東西一樣，如果saa.Date爲null，則[使用日期範圍以上參數]

Answer 1

我基地我的答案在@ AHiggins的，但加入性能可讀性

- sergability

- 避免cast

- using between

WHERE 
    ProjectID=110 AND 
    (
     (
     saa.Date between '09/24/2014 00:00:00.000' AND '09/24/2014 23:59:59.999' 
    ) OR 
     (
     saa.Date IS NULL AND 
     (
      sa.StartDateTime between '09/24/2014 00:00:00.000' AND '09/24/2014 23:59:59.999' 
     ) OR 
     (
      sa.EndDateTime between '09/24/2014 00:00:00.000' AND '09/24/2014 23:59:59.999' 
     ) 
    ) 
    )  

確保你有我在茨艾倫日期列ndexes

Answer 2

試試這個

(
     (CAST(ISNULL(sa.StartDateTime, '09/24/2014') AS DATE) >= '09/24/2014' AND CAST(ISNULL(saa.StartDateTime, '09/24/2014') AS DATE) <= '09/24/2014') 
) 

Answer 3

如果我讀它的權利，你應該能夠與布爾邏輯和幾百萬括號來做到這一點：

編輯：注意到在評論上@ horaciux的回答有一個問題，意識到我們實際上需要多一些括號。我借用了借來的代碼，並在下面添加了額外的代碼。

WHERE 
    ProjectID=110 AND 
    (
     (
     saa.Date between '09/24/2014 00:00:00.000' AND '09/24/2014 23:59:59.999' 
    ) OR 
     (
     saa.Date IS NULL AND 
     (-- need to wrap the next two conditions in a single set of parentheses 
      (
      sa.StartDateTime between '09/24/2014 00:00:00.000' AND '09/24/2014 23:59:59.999' 
     ) OR 
      (
      sa.EndDateTime between '09/24/2014 00:00:00.000' AND '09/24/2014 23:59:59.999' 
     ) 
     ) 
    ) 
    ) 

Answer 4

你知道

>= '09/24/2014' 
AND <= '09/24/2014' 

相同 = '09 /2014分之24'

where ProjectID=110 
    AND CAST(saa.Date AS DATE) = '09/24/2014' 
    OR (
     saa.Date IS NULL 
     AND 
      ( 
       CAST(sa.StartDateTime AS DATE) = '09/24/2014' 
       OR 
       CAST(sa.EndDateTime AS DATE) = '09/24/2014' 
      )    
    ) 

這比鑄造更高效：

DATEADD(dd, DATEDIFF(dd, 0, COL),0) 

但是Horaciux的答案更加高效