The Power Query M function reference includes articles for each of the over 700 functions. These reference articles are auto-generated from in-product help. To learn more about functions and how they work in an expression, go to Understanding Power Query M functions....
Power Query M is used to filter, combine, and mash-up data from one or more supported data sources.
Power Query M 语言规范 Power Query M 语言规范 简介 词法结构 基本概念 值 类型 运算符 Let 条件语句 函数 错误处理 节 合并语法 Power Query M 类型系统 表达式、值和 let 表达式 注释 计算模型 运算符 类型转换 元数据 错误 文本格式 函数 枚举 ...
Power Query M 复制 [A=B, B=A] // [A = Error.Record("Expression.Error", // "A cyclic reference was encountered during evaluation"), // B = Error.Record("Expression.Error", // "A cyclic reference was encountered during evaluation"), // ] M 中的一些运算符由结构递归定义。 例如,...
通过前面的文章,相信大家对Power Query有了一个初步印象。从这篇文章开始,我们将介绍M函数在Power Query中的应用,这个系列会以微软发布的M函数官方文档为基础,官方文档参考地址:Power Query M formula language reference - PowerQuery M。 一、M函数简介
这其实是目前的常态,意味着大量的手工导入和清洗过程,但 Power Query 将改变了这种现状。 5.1 了解系统如何导入数据 “TXT” 和“CSV” 文件是平常所说的 “平面” 文件,之所以这样命名是因为它们缺少一个称为 “架构(Schema)” 的元数据层,即描述文件内容的信息。这一点至关重要,因为这意味着当数据被导入到另...
这其实是目前的常态,意味着大量的手工导入和清洗过程,但 Power Query 将改变了这种现状。 5.1 了解系统如何导入数据 “TXT” 和“CSV” 文件是平常所说的 “平面” 文件,之所以这样命名是因为它们缺少一个称为 “架构(Schema)” 的元数据层,即描述文件内容的信息。这一点至关重要,因为这意味着当数据被导入到另...
Library functions may expose external state (such as the current time or the results of a query against a database that evolves over time), rendering them non-deterministic. While functions defined in M will not, as such, expose any such non-deterministic behavio...
s “Get Data” & “Query Editor” experiences: Data Source connection dialogs, Filter Rows and Replace Values. In the future, we will add support for referencing parameters from more dialogs. As a temporary workaround, you can reference parameters via the M code for any step in your queries...
s “Get Data” & “Query Editor” experiences: Data Source connection dialogs, Filter Rows and Replace Values. In the future, we will add support for referencing parameters from more dialogs. As a temporary workaround, you can reference parameters via the M code for any step in your queries...