Learn about Power Query formulas
With Microsoft Power Query for Excel, you can add custom columns to your queries. For more information about custom columns, see Insert a custom column into a table. The Power Query Formula Language provides a wide variety of formulas that are used to build complex expressions.
Power Query formulas can be written or modified in the Query Editor, by using the formula bar.
To show the formula bar:
Click Settings > Show Formula Bar in the Query Editor.
Power Query provides a powerful data query and shaping experience for Excel that encompasses many capabilities. A core capability of Power Query is to filter and reshape data from a large collection of data sources. Any such data query is expressed using the Power Query Formula Language. To learn about the Power Query Formula Language:
Power Query formula categories – Concise Power Query formula reference with syntax, arguments, remarks, and examples for all formulas.
Microsoft Power Query for Excel Formula Language Specification (PDF) – Comprehensive explanation of the Power Query Formula Language (informally known as "M"). Power Query embeds M documents in Excel workbooks to enable repeatable mashup of data.
Power Query Formula Library Specification (PDF) – Concise Power Query formula reference with syntax, arguments, remarks, and examples for all formulas.