Question

我的桌子的日期为2014年3月2日，3/5 / 2014,6 / 21/2014，2014年8月16日，2015年1月5日。我需要一种在每个月每天显示的方法，如果日期存在则显示Y，如果不存在，则显示N.该表是动态的，可以添加更多日期。

示例：

          March 2014
1 | 2 | 3 | 4 | 5 | ... | 31
N | N | Y | N | Y | ... | N
          July 2014
1 | 2 | ... | 20 | 21 | 22 | ... | 31
N | N | ... | N  | Y  | N  | ... | N
          August 2014
1 | 2 | ... | 20 | 21 | 22 | ... | 31
N | N | ... | N  | Y  | N  | ... | N
          January 2015
1 | 2 | ... | 15 | 16 | 17 | ... | 31
N | N | ... | N  | Y  | N  | ... | N

我是Access的新手，所以任何帮助都会受到赞赏：）

更新：如果我想将上面的例子改为where而不是只返回“Y”或“N”我现在想要返回一个项目ID，我将如何编辑IIF语句？项目ID与日期存储在同一个表中。

          March 2014
1 | 2 |  3  | 4  | 5   | ... | 31
N | N |  4B | N  | 2W  | ... | N
          July 2014
1 | 2 | ... | 20 | 21  | 22  | ... | 31
N | N | ... | N  | Z8  | N   | ... | N
          August 2014
1 | 2 | ... | 20 | 21  | 22  | ... | 31
N | N | ... | N  | E5  | N   | ... | N
          January 2015
1 | 2 | ... | 15 | 16  | 17  | ... | 31
N | N | ... | N  | 1FF | N   | ... | N

Answer 1

您需要编写CrossTab查询（pivot）。类似的东西：

TRANSFORM iif(Count(*)>0,"Y","N") AS Val
SELECT Year(YourDate) AS Y, Month(YourDate) AS M
FROM YourTable
GROUP BY Year(YourDate), Month(YourDate)
PIVOT Day(YourDate) In ("01","02","03","04","05","06","07","08","09","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24","25","26","27","28","29","30","31");

访问 - 报告格式和显示

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