Question

所以基本上我想知道如果日期不同，如何在日期上联接两个表。第一个表是我的主表，其中包括我所有已购买商品的客户。购买日期是过去的一点：

Customers
    +--------+----------+-------+------------+
    | custid | Quantity | Price | ReportDate |
    +--------+----------+-------+------------+
    | 371965 |       12 |     2 | 9/1/2016   |
    | 371965 |        2 |     5 | 2/25/2018  |
    | 377958 |       45 |     3 | 9/1/2016   |
    | 270723 |       12 |  1.25 | 5/1/2014   |
    | 270723 |    10.86 |  1.25 | 6/1/2014   |
    | 270723 |    12.29 |   1.3 | 7/1/2014   |
    | 270723 |    12.29 |   1.4 | 9/15/2016  |
    +--------+----------+-------+------------+

所以我想加入折扣表中的我的客户表。折扣生效的时间基本上是整个时间，直到发出新折扣为止：

Discounts
    +----+-----------+----------+
    | id | startdate | discount |
    +----+-----------+----------+
    |  1 | 7/18/2013 |      0.1 |
    |  2 | 1/10/2014 |     0.25 |
    |  3 | 7/11/2016 |     0.11 |
    |  4 | 9/14/2016 |     0.12 |
    |  5 | 1/12/2017 |     0.15 |
    |  6 | 2/6/2017  |     0.22 |
    |  7 | 6/28/2017 |     0.09 |
    +----+-----------+----------+

所以我的目标是链接两个表，并查看哪个购买日期在折扣的适当间隔内。这就是我的目标：

+--------+----------+-------+------------+----+-----------+----------+
| custid | Quantity | Price | ReportDate | id | startdate | discount |
+--------+----------+-------+------------+----+-----------+----------+
| 371965 |       12 |     2 | 9/1/2016   |  3 | 7/11/2016 |     0.11 |
| 371965 |        2 |     5 | 2/25/2018  |  7 | 6/28/2017 |     0.09 |
| 377958 |       45 |     3 | 9/1/2016   |  3 | 7/11/2016 |     0.11 |
| 270723 |       12 |  1.25 | 5/1/2014   |  2 | 41649     |     0.25 |
| 270723 |    10.86 |  1.25 | 6/1/2014   |  2 | 1/10/2014 |     0.25 |
| 270723 |    12.29 |   1.3 | 7/1/2014   |  2 | 1/10/2014 |     0.25 |
| 270723 |    12.29 |   1.4 | 9/15/2016  |  4 | 9/14/2016 |     0.12 |
+--------+----------+-------+------------+----+-----------+----------+

感谢您的帮助！!!!!!!

Answer 1

您可以使用OUTER APPLY选择报告日期之前存在的TOP 1折扣，按日期降序排列以获取最新的运行时间

  SELECT C1.*,DQ.*  FROM CUSTOMERS C1 OUTER APPLY 
                 (SELECT TOP 1 D.* FROM Discounts D WHERE C1.ReportDate >= D.startDate  
                                       ORDER BY D.StartDate DESC) DQ

Answer 2

您可以这样加入：

switch (mimeType) {
    case "application/vnd.google-apps.spreadsheet": {
        mimeType = "text/csv"; //CSV: WORKING
        //mimeType = "application/x-vnd.oasis.opendocument.spreadsheet"; //OPEN OFFICE: NOT WORKING (GARBLED)
        //mimeType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"; //MS EXCEL: NOT WORKING (GARBLED)
        break;
    }
    case "application/vnd.google-apps.document": {
        //mimeType = "text/plain"; //PLAIN TEXT: WORKING (DOUBLE TEXT IN THE FILE, BUT NOT THE API EXPLORER)
        mimeType = "application/rtf"; //RICH TEXT: WORKING
        //mimeType = "application/vnd.oasis.opendocument.text"; //OPEN OFFICE DOC: NOT WORKING (GARBLED)
        //mimeType = "application/vnd.openxmlformats-officedocument.wordprocessingml.document"; //MS WORD DOCUMENT (GARBLED)
        break;
    }
    case "application/vnd.google-apps.presentation": {
        mimeType = "application/pdf"; //PLAIN TEXT: WORKING
        //mimeType = "application/vnd.openxmlformats-    officedocument.presentationml.presentation"; //MS POWER POINT (GARBLED)
        //mimeType = "application/vnd.oasis.opendocument.presentation"; //OPEN OFFICE (GARBLED)
        break;
    }
    case "application/vnd.google-apps.drawing": {
        mimeType = "image/png"; //PNG: WORKING
        //mimeType = "image/jpeg"; //JPEG: WORKING
        //mimeType = "image/pdf"; //NOT WORKING (INVALID FILE: ACROBAT DOESN'T LIKE IT)
        break;
    }
    default: {
        googleDoc = false;
        break;
    }
}

请参见demo

Answer 3

另一个选择

;with cte as (
Select A.* 
      ,B.*
      ,RN = row_number() over (Partition by custid,reportdate order by startdate desc)
 From Customers A
 Join Discounts B on B.startdate<=A.ReportDate
) 
Select * 
 From  cte 
 Where RN=1

dbFiddle

日期不同时联接日期表

3 个答案: