Question

我有一个MS Access数据库，用于每个客户端ID的产品ID列表。

目前，该表格设置如下：

CLI_ID || PRODUCT_ID
963506 || 49001608
968286 || 49001645
987218 || 00048038
987218 || 49001401
999999 || 9999999    
999999 || 9999998
999999 || 9999997
999999 || 9999996

我想将数据转置为如下所示：

CLI_ID || PRODUC1  || PRODUC2  || PRODUC3  || PRODUC4  ||
963506 || 49001608 ||
968286 || 49001645 ||
987218 || 00048038 || 49001401 ||
999999 || 99999999 || 99999998 || 99999997 || 99999996 ||

在上面的示例中，有些客户的产品数量超过了4个，因此我希望通过计算每个客户端ID中的产品ID数量来扩展查询。

我从ChrisPadgham's post获取了代码并对其进行了修改以满足我的需求......这是我到目前为止所做的，但它不会比PRODUC1更进一步：

TRANSFORM Last([PRODUCT_ID]) AS Details
SELECT Source_Table.CLI_ID
FROM Source_Table
GROUP BY Source_Table.CLI_ID
PIVOT "PRODUC" & (DCount("[PRODUCT_ID]","[Source_Table]", "[PRODUCT_ID]<>" & 
[PRODUCT_ID] & " AND [CLI_ID]=" & [CLI_ID]) +1);

任何帮助将不胜感激！

Answer 1

尝试为您的数据添加每个客户项计数器。 Examples Found Here

看起来你需要创建一个临时表，因为Access在嵌套查询时无法跟踪内部指针。

创建临时表：

SELECT t1.CLI_ID, t1.PRODUCT_ID, (SELECT COUNT(*) 
FROM Source_Table t2 
WHERE t2.CLI_ID = t1.CLI_ID 
AND t2.PRODUCT_ID <= t1.PRODUCT_ID 
) AS PROD_COUNT INTO TEMP_CLI_PROD
FROM Source_Table AS t1
GROUP BY t1.CLI_ID, t1.PRODUCT_ID;

然后让您的数据透视表引用临时表。

TRANSFORM Last(TEMP_CLI_PROD.PRODUCT_ID) AS LastOfPRODUCT_ID
SELECT TEMP_CLI_PROD.CLI_ID
FROM TEMP_CLI_PROD
GROUP BY TEMP_CLI_PROD.CLI_ID
PIVOT "PRODUCT " & TEMP_CLI_PROD.PROD_COUNT;

输出：

CLI_ID  PRODUCT 1     PRODUCT 2     PRODUCT 3     PRODUCT 4
963506  49001608
968286  49001645
987218  00048038      49001401
999999  9999996       9999997       9999998       9999999

Answer 2

Jeff的答案基本上是正确的，尽管不严格要求临时表：

TRANSFORM First(PRODUCT_ID) AS whatever
SELECT CLI_ID
FROM
    (
        SELECT t1.CLI_ID, t1.PRODUCT_ID, 'PRODUCT_' & COUNT(*) AS XtabColumn
        FROM 
            Source_Table AS t1
            INNER JOIN
            Source_Table AS t2
                ON t1.CLI_ID = t2.CLI_ID
                    AND t1.PRODUCT_ID >= t2.PRODUCT_ID
        GROUP BY t1.CLI_ID, t1.PRODUCT_ID
    )
GROUP BY CLI_ID
PIVOT XtabColumn

返回

CLI_ID  PRODUCT_1  PRODUCT_2  PRODUCT_3  PRODUCT_4
------  ---------  ---------  ---------  ---------
963506  49001608                                  
968286  49001645                                  
987218  00048038   49001401                       
999999  9999996    9999997    9999998    9999999

根据公共ID值将行数据转换为新列

2 个答案: