This is an introductory session about DAX. If you want to learn DAX then contact me.

1. PASS
Chennai Power BI – August 2018CPBIG Monthly Webinar
DAX - 101
Hariharan Rajendran
Microsoft Certified Trainer

2. CPBIG
Sponsors
PASS

3. CPBIG
About Speaker
Hariharan
Lead Consultant, Your SQL Man (I) Pvt Ltd
Solution Expert in MSBI
Microsoft SQL Server, Azure & BI
SAP HANA & Business Objects
Speaker in DPS2017,DDD & CSSUG
Blog
http://dataap.org/author/hariharanr/
Twitter
@imhariharanr
Linked In
hariharan-r-12635640
Email
hari@yoursqlman.com
Group Leader

4. CPBIG
DAX
Data Analysis Expressions
Functional Language
• The execution flows with function calls.
This is for
• Power Pivot
• Power BI
• SSAS Tabular

5. CPBIG
Data Types
Integer – 64 bit
Decimal – floating point
Currency – Money
Date & Time
TRUE / FALSE – Boolean
String
Binary Objects

6. CPBIG
Data Type Conversion
 + = Integer ; & = String
Example
• “5” + “4” = 9
• 5 & 4 = 54
Internal type conversion
Operator overloading – Result depends on the inputs
Date – Floating Point Value
Date + 1 = ?
Date & 1= ?

7. CPBIG
DAX References
Table Reference
• ‘Date’ or Date
• ‘Sales Region’
Column Reference
• ‘Date’[Year]
• ‘Sales Region’[City]
Measure Reference
• [Total Sales]

8. CPBIG
Purpose of DAX
Calculated Columns
• Value is computed for each row
• Materialized in tables as a static column – It consumes memory
• It can be used for slicers and filters
• All rows contain same formula.
Calculated Measures
• Numeric calculation
• Not Materialized
• Dynamic – Does not consume memory
• Evaluated for each row based on the given context.

9. CPBIG
Navigation Functions
RELATED
• Follows the relationships and returns the
value of a column
• Single value as a result
RELATEDTABLE
• Follows relationships and returns all the rows
in relationship with the current row value.

10. CPBIG
Logical & Conditional Functions
Testing (Returns True &
False)
• ISBLANK
• ISERROR
• ISLOGICAL
• ISNONTEXT
• ISNUMBER
• ISTEXT
Logical
• AND
• IF
• IFERROR
• NOT
• OR
Example = 5+10+
IF(
ISNUMBER("A")=FALSE,"0","A“
)

11. CPBIG
Conditional Functions - SWITCH
Advantages over IF
• Easier to debug due to simpler code
• Easier to write
Checks for exact matches
• [MONTH]=1
TRUE()
• Allow range matches

12. CPBIGCPBIG
DEMO

13. CPBIG
Filter Context
Applied by Filter constraints
• Row and Column Headers
• Slicers and Filters
• DAX Formula Filters

14. CPBIG
Calculate Function
Apply a filter(s) to an expression
Ratios / Percent of Totals
• CALCULATE(<expression>, <filter1>, <filter2>…)
Expression – An aggregate
Filter – Override filter context
ResellerSales = CALCULATE([Total Sales], ‘store’[StoreType]=“Reseller”)
AllProductSales = CALCULATE([Total Sales], ALL(Product))

15. CPBIG
Time Intelligence
FIRSTDATE
LASTDATE
DATESBETWEEN
DATEADD
STARTOFMONTH
STARTOFQUARTER
STARTOFYEAR
ENDOFMONTH
ENDOFQUARTER
ENDOFYEAR
PARALLELPERIOD
PREVIOUSDAY
PREVIOUSMONTH
PREVIOUSQUARTER
PREVIOUSYEAR
NEXTDAY
NEXTMONTH
NEXTQUARTER
NEXTYEAR
DATESMTD
DATESQTD
DATESYTD
SAMEPERIODLASTYEAR
TOTALMTD
TOTALQTD
TOTALYTD
OPENINGBALANCEMONTH
OPENINGBALANCEQUARTER
OPENINGBALANCEYEAR
CLOSING….

16. CPBIGCPBIG
DEMO

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Q & A

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Thank You - நன்றி