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DAX Language - Data Analysis Expression



The DAX language was created specifically for the handling of data models, through the use of formulas and expressions. DAX is used in several Microsoft Products such as Microsoft Power BI, Microsoft Analysis Services and Microsoft Power Pivot for Excel.

Below are the types of Dax functions 

1. Aggregate 
2. Date and time
3. Filter
4. Financial 
5. Information 
6. Logical
7. Maty and trig
8. Other
9. Parent and child
10. Relationship Management 
11. Statistical 
12. Table manipulation 
13. Text
14. Time intelligence 

From the above list of functions 3 types of functions are basic and commonly used, those are Aggregate , Logical and Date and time.


Other important entities which are used with the above function are as follows 

1. Operators 
Example -  ( ), + , Not, &, =, < >, ||

2. Statements 
Define , Evaluate,  Order by, Return, Var

3. Data Types
Binary, boolean,  Currency,  date time, decimal, integer, String , Variant.


In crude language DAX is an advanced version of Excel formulas.
DAX contains similar formulas as in Excel. With dax functions you can filter the data according to specific conditions as we do it with slicers and filter we do in excel.
In DAX data is stored in tabular format. 
There are two Primary calculation you can create using DAX 
1. Calculated column
It means formulas written in columns 

2. Measures 
Formulas written in the area below table.
A formula used to manipulate data is called a measures. 


Advice - I have worked in many automation projects and used Dax functions for past 3 years. While working don't limit your thought process to what you know think what you want i.e the final result. If you don't know the formula but you have a basic idea of the end result then you are on track just search on google and you will get the answers.



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