SQLBits 2024
Demystifying Power BI Variables: A Comprehensive Guide to Understanding DAX and M Variables
This session is a deep dive into the use of variables within DAX and Power Query M for developing complex logic in Power BI solutions. It begins with an exploration of the Queries pane as the base for variable creation in M, using the "let" and "in" operators, then examines the use of both global and local variables in DAX, emphasizing their nature as constants. Common use cases and potential pitfalls will be discussed, along with the concept of precedence in variable usage across multiple scopes. Attendees will gain a nuanced understanding of variable application in the two main engines of Power BI.
When you're in the process of developing your solution using either DAX or Power Query, you may encounter situations where crafting intricate logic becomes essential. In such cases, breaking down your logic into variables can prove immensely beneficial.
In this session, we'll embark on a journey to demystify the Power Query M environment. We'll delve into why the Queries pane serves as the foundational layer of variables, followed by the applied steps as the second layer. Additionally, we'll explore how you can create your own variables for complex calculations using the "let" and "in" operators.
Moving forward, we'll shift our focus to DAX variables. We'll discuss both global and local variables, shedding light on the concept that variables in DAX are essentially constants. We'll also showcase some common use cases and provide insights on how to steer clear of potential pitfalls when using them.
Throughout our exploration of both DAX and M, we'll thoroughly cover the concept of precedence, especially when a variable is utilized within multiple scopes.
By the end of this session, you'll possess a comprehensive and broader understanding of how variables are applied within the two principal engines of Power BI.
In this session, we'll embark on a journey to demystify the Power Query M environment. We'll delve into why the Queries pane serves as the foundational layer of variables, followed by the applied steps as the second layer. Additionally, we'll explore how you can create your own variables for complex calculations using the "let" and "in" operators.
Moving forward, we'll shift our focus to DAX variables. We'll discuss both global and local variables, shedding light on the concept that variables in DAX are essentially constants. We'll also showcase some common use cases and provide insights on how to steer clear of potential pitfalls when using them.
Throughout our exploration of both DAX and M, we'll thoroughly cover the concept of precedence, especially when a variable is utilized within multiple scopes.
By the end of this session, you'll possess a comprehensive and broader understanding of how variables are applied within the two principal engines of Power BI.