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Questions and Answers
What is the purpose of DAX in Power BI?
What is the purpose of DAX in Power BI?
What is a measure in DAX?
What is a measure in DAX?
What is the correct syntax for a DAX formula?
What is the correct syntax for a DAX formula?
Which type of DAX function is used to perform calculations such as SUM and AVERAGE?
Which type of DAX function is used to perform calculations such as SUM and AVERAGE?
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What is the purpose of the FILTER function in DAX?
What is the purpose of the FILTER function in DAX?
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What is a best practice when writing DAX formulas?
What is a best practice when writing DAX formulas?
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What is the purpose of the CALCULATE function in DAX?
What is the purpose of the CALCULATE function in DAX?
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What is an example of a simple measure in DAX?
What is an example of a simple measure in DAX?
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What is the purpose of the ALL function in DAX?
What is the purpose of the ALL function in DAX?
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What is an example of a calculated column in DAX?
What is an example of a calculated column in DAX?
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Study Notes
DAX Formulas in Power BI
What is DAX?
- DAX (Data Analysis Expressions) is a formula language used in Power BI to define calculations and create measures.
- It is similar to Excel formulas, but more powerful and flexible.
Basic Concepts
- Measures: Calculated fields that can be used in reports, such as sums, averages, and counts.
- Columns: Fields that contain data, such as dates, names, or numbers.
- Tables: Collections of related data, similar to Excel worksheets.
DAX Formula Structure
-
Syntax:
Measure Name = DAX Formula -
Formula: A calculation that returns a value, using a combination of:
- Operators: Arithmetic, comparison, logical, and text operators.
- Functions: Built-in functions, such as SUM, AVERAGE, and FILTER.
- Values: Literals, such as numbers, texts, or dates.
- References: References to tables, columns, and measures.
DAX Functions
-
Aggregation Functions:
- SUM, AVERAGE, MIN, MAX, COUNT, etc.
-
Filter Functions:
- FILTER, FILTERS, ALL, ALLEXCEPT, etc.
-
Logical Functions:
- IF, IFERROR, IFBLANK, etc.
-
Time Intelligence Functions:
- YEAR, MONTH, DAY, HOUR, MINUTE, SECOND, etc.
DAX Formula Examples
-
Simple Measure:
Total Sales = SUM(Sales[Sales Amount]) -
Calculated Column:
Product[Price Including VAT] = Product[Price] * 1.2 -
Filter Measure:
Sales This Year = CALCULATE(SUM(Sales[Sales Amount]), FILTER(Sales, Sales[Date] >= STARTOFYEAR(TODAY())))
Best Practices
- Keep it Simple: Break down complex formulas into smaller, reusable pieces.
- Use Meaningful Names: Choose clear and descriptive names for measures and columns.
- Test and Refine: Verify formulas with sample data and refine as needed.
DAX Formulas in Power BI
What is DAX?
- DAX (Data Analysis Expressions) is a formula language used in Power BI to define calculations and create measures.
- It is similar to Excel formulas, but more powerful and flexible.
Basic Concepts
- Measures: Calculated fields that can be used in reports, such as sums, averages, and counts.
- Columns: Fields that contain data, such as dates, names, or numbers.
- Tables: Collections of related data, similar to Excel worksheets.
DAX Formula Structure
-
Syntax:
Measure Name = DAX Formula - A formula consists of a combination of operators, functions, values, and references.
- Operators include arithmetic, comparison, logical, and text operators.
- Functions include built-in functions like SUM, AVERAGE, and FILTER.
- Values include literals like numbers, texts, or dates.
- References include references to tables, columns, and measures.
DAX Functions
Aggregation Functions
- SUM, AVERAGE, MIN, MAX, COUNT, etc.
Filter Functions
- FILTER, FILTERS, ALL, ALLEXCEPT, etc.
Logical Functions
- IF, IFERROR, IFBLANK, etc.
Time Intelligence Functions
- YEAR, MONTH, DAY, HOUR, MINUTE, SECOND, etc.
DAX Formula Examples
-
Simple Measure: Calculate the total sales using
Total Sales = SUM(Sales[Sales Amount]). -
Calculated Column: Calculate the product price including VAT using
Product[Price Including VAT] = Product[Price] * 1.2. -
Filter Measure: Calculate the sales for the current year using
Sales This Year = CALCULATE(SUM(Sales[Sales Amount]), FILTER(Sales, Sales[Date] >= STARTOFYEAR(TODAY()))).
Best Practices
- Keep it Simple: Break down complex formulas into smaller, reusable pieces.
- Use Meaningful Names: Choose clear and descriptive names for measures and columns.
- Test and Refine: Verify formulas with sample data and refine as needed.
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Description
Learn about DAX, a formula language used in Power BI to define calculations and create measures, similar to Excel formulas. Understand basic concepts like measures, columns, and tables.
