Question

我目前有这个WHERE子句，其中包含以下参数。

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))

这里棘手的部分是saa.Date is NULL部分将在所有日期中提取所有Null值（这是过多的）我只想使用{{1的以下日期范围值

Null

所以我试图找出如何创建( (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') )语句，它可以像IF saa.Date是NULL然后[使用上面的日期范围参数]

Answer 1

我的答案基于@ AHiggins，但增加了性能和可读性

- 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'
         )
      )
     )

确保您在日期列上有索引

Answer 2

如果我正确阅读它，你应该能够用布尔逻辑和几百万括号来做到这一点：

编辑：在关于@ horaciux回答的评论中注意到存在问题，意识到我们实际上需要更多的括号。我借用了借来的代码，并在下面添加了额外内容。

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 3

你知道吗

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

与...相同 = '09 / 24/2014'

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' 
            )              
      )

这比演员效率更高：

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

但Horaciux的答案更有效率

Answer 4

试试这个

(
        (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')
)

在日期的Where子句中使用Case

4 个答案: