Power BI multiple if 包含从 Tableau 计算的度量的拆分转换

Question

我是 Power BI 的新用户，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) 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，我根据以下计算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。谁能指出我正确的方向？

非常感谢您的帮助！

Answer 1

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

解决方案 1：DAX

Table

+--------------------------------------+
|                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  |
+--------------------------------------+

在不知道你的数据的情况下，最简单的解决方案是提取 ? 符号之前的所有内容，我可以想象你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)

正在创建这个table

+--------------------------------------+----------------------------+
|                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", "|" ), 2, TEXT ) & ".aspx",
    CONTAINSSTRING ( [Detail1], ".ppt" ), PATHITEMREVERSE ( SUBSTITUTE ( [Detail1], ".ppt", "|" ), 2, TEXT ) & ".ppt",
    CONTAINSSTRING ( [Detail1], ".pdf" ), PATHITEMREVERSE ( SUBSTITUTE ( [Detail1], ".pdf", "|" ), 2, TEXT ) & ".pdf",
    CONTAINSSTRING ( [Detail1], ".doc" ), PATHITEMREVERSE ( SUBSTITUTE ( [Detail1], ".doc", "|" ), 2, TEXT ) & ".doc",
    [Detail1]
)

输出Table

+--------------------------------------+----------------------------+
|                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  |
+--------------------------------------+----------------------------+

由于某些原因，Whosebug 不支持带有 // 的 Markdown table。

Power BI multiple if 包含从 Tableau 计算的度量的拆分转换

Power BI multiple if contains split converting from Tableau calculated measure

powerbi

dax

tableau-api

powerbi-desktop

解决方案 1：DAX

Table

解决方案 2：DAX

输出Table