如何解决Power BI 倍数如果包含从 Tableau 计算的度量转换的拆分

我是一名 Power BI 新用户，突然从 Tableau 切换过来，但我在使用 DAX 表达式时遇到了一些问题。

我有一列 (Detail1) 的 URL，其中一些（以 .aspx、.ppt、.pdf、.doc 结尾）附加了一些垃圾字符串。在 tableau 中，我从以下计算中创建了一个计算列来清理它们：

    IF CONTAINS([Detail1],".aspx") THEN
        SPLIT([Detail1],".aspx",1) + ".aspx"
    ELSEIF CONTAINS([Detail1],".ppt") THEN
        SPLIT([Detail1],".ppt",1) + ".ppt"
    ELSEIF CONTAINS([Detail1],".pdf") THEN
        SPLIT([Detail1],".pdf",1) + ".pdf"
    ELSEIF CONTAINS([Detail1],".doc") THEN
        SPLIT([Detail1],".doc",1) + ".doc"
    ELSE
        [Detail1]
    END

但是我在 DAX 表达式中很难做到这一点。有人能指出我正确的方向吗？

非常感谢您的帮助！

解决方法

我创建了一个虚拟表，其中包含带有不需要的额外信息的 URL。我有两个 DAX 解决方案可以解决您的问题。

解决方案 1：DAX

表格

+--------------------------------------+
|                Detail1               |
+--------------------------------------+
| https://url.com/page1.aspx?extrainfo |
+--------------------------------------+
| https://url.com/page1.doc?extrainfo  |
+--------------------------------------+
| https://url.com/page1.ppt?extrainfo  |
+--------------------------------------+
| https://url.com/page1.pdf?extrainfo  |
+--------------------------------------+
| https://url.com/page1.doc?extrainfo  |
+--------------------------------------+

在不知道您的数据的情况下，最简单的解决方案是提取 ? 符号之前的所有内容，我可以想象您的数据集中可能有类似的结构。

如果是这种情况，您可以创建以下计算列

CleanUrl = 
PATHITEMREVERSE(SUBSTITUTE([Detail1],"?","|"),2,TEXT)

创建此表

+--------------------------------------+----------------------------+
|                Detail1               |          CleanUrl          |
+--------------------------------------+----------------------------+
| https://url.com/page1.aspx?extrainfo | https://url.com/page1.aspx |
+--------------------------------------+----------------------------+
| https://url.com/page1.doc?extrainfo  | https://url.com/page1.doc  |
+--------------------------------------+----------------------------+
| https://url.com/page1.ppt?extrainfo  | https://url.com/page1.ppt  |
+--------------------------------------+----------------------------+
| https://url.com/page1.pdf?extrainfo  | https://url.com/page1.pdf  |
+--------------------------------------+----------------------------+
| https://url.com/page1.doc?extrainfo  | https://url.com/page1.doc  |
+--------------------------------------+----------------------------+

解决方案 2：DAX

如果您的列 Detail1 中没有明确的模式，则以下计算列采用相同的逻辑并将其调整为 DAX。

CleanUrlV2 =
    SWITCH (
    TRUE (),CONTAINSSTRING ( [Detail1],".aspx" ),PATHITEMREVERSE ( SUBSTITUTE ( [Detail1],".aspx","|" ),TEXT ) & ".aspx",".ppt" ),".ppt",TEXT ) & ".ppt",".pdf" ),".pdf",TEXT ) & ".pdf",".doc" ),".doc",TEXT ) & ".doc",[Detail1]
)

输出表

+--------------------------------------+----------------------------+
|                Detail1               |         CleanUrlV2         |
+--------------------------------------+----------------------------+
| https://url.com/page1.aspx?extrainfo | https://url.com/page1.aspx |
+--------------------------------------+----------------------------+
| https://url.com/page1.doc?extrainfo  | https://url.com/page1.doc  |
+--------------------------------------+----------------------------+
| https://url.com/page1.ppt?extrainfo  | https://url.com/page1.ppt  |
+--------------------------------------+----------------------------+
| https://url.com/page1.pdf?extrainfo  | https://url.com/page1.pdf  |
+--------------------------------------+----------------------------+
| https://url.com/page1.doc?extrainfo  | https://url.com/page1.doc  |
+--------------------------------------+----------------------------+

出于某种原因，Stackoverflow 不支持带有 // 的 Markdown 表。