Please join us online for the next Atlanta MS BI and Power BI Group meeting on Monday, June 6th, at 6:30 PM ET. For more details and sign up, visit our group page. Presentation: How Power Query Thinks: Taking the Mystery Out of Streaming and Query Folding Date: June 6th Time: 6:30 – 8:30 PM ET Place: Click here to join the meeting Overview: How…
Read article Please join us online for the next Atlanta MS BI and Power BI Group meeting on Monday, April 4th, at 6:30 PM ET. Michael Carlo (Power BI MVP) will show how to speed up your data modeling experience by using DAX templates. For more details and sign up, visit our group page. Presentation: World's Fastest DAX - Using Quick DAX Templates Date: April 4th Time:…
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Suppose you use a DAX table variable, such as to group by certain columns and add an extension column as a calculation. Then, you want to count the rows in the table by filtering on one of the columns. At your first attempt, you might try using CALCULATE. VAR _t = ADDCOLUMNS(SUMMARIZE(…), "SomeColumn", <some expression>) RETURN CALCULATE(COUNTROWS(_t), _t[SomeColumn] = something) You'll get an error that…
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I've noticed severe performance degradation after refreshing a Power BI Desktop model with some five million rows. The Power BI Desktop process showed a sustained 50-60 % utilization for minutes in the Windows Task Manager. I did a profiler trace and I saw expensive DAX queries like these: EVALUATE SELECTCOLUMNS(FILTER(VALUES('Sales'[PONumber]),LEN('Sales'[PONumber])<=100),"valueColumn",'Sales'[PONumber]) EVALUATE SELECTCOLUMNS(FILTER(VALUES('Sales'[SalesOrderNumber]),LEN('Sales'[SalesOrderNumber])<=100),"valueColumn",'Sales'[SalesOrderNumber]) EVALUATE SELECTCOLUMNS(FILTER(VALUES('Sales'[InvoiceNumber]),LEN('Sales'[InvoiceNumber])<=100),"valueColumn",'Sales'[InvoiceNumber]) As it turned out, Power BI Desktop autogenerates these queries when…
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Happy 4th of July with a DAX puzzle! Consider the following three tables. Notice that InvoiceDetails has a data integrity issue where the third row doesn't have InvoiceNo (InvoiceNo is blank). What would a measure with COUNTROWS(Invoice) return for Teo? BLANK(), right? And that's correct because Teo has no invoices. Now, what would COUNTROWS(InvoiceDetails) return for Teo? BLANK() again given that Teo has no line…
Read article MS BI fans, the time has come for a virtual meeting. Please join us online for the next Atlanta MS BI and Power BI Group meeting on Monday, April 6th, at 6:30 PM. I'll show you how business analysts can apply AutoML in Power BI Premium to create predictive models. For more details, visit our group page and don't forget to RSVP (fill in the RSVP…
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Null and zero typically have different semantics, where null indicates an unknown or missing value while zero is an explicit value. Sometimes, however, you want to show nulls as zeros. For example, an insurance company might want to show 0 claims instead of a blank value. By default, when a DAX filter doesn't find any rows, the formula returns null (BLANK in DAX). For example,…
Read article MS BI fans, join us for the next Atlanta MS BI and Power BI Group meeting on February 3rd, Monday, at 6:30 PM at the Microsoft office in Alpharetta. Shabnan Watson will discuss how to apply aggregations to Power BI DirectQuery datasets to improve report performance. Melissa will sponsor the meeting. For more details, visit our group page and don't forget to RSVP (fill in the RSVP survey if you're planning…
Read article MS BI fans, join us for the next Atlanta MS BI and Power BI Group meeting on January 6th, Monday, at 6:30 PM at the Microsoft office in Alpharetta. I'll introduce to Power BI Premium Automated Machine Learning (AutoML). Prologika will sponsor the meeting. For more details, visit our group page and don't forget to RSVP (fill in the RSVP survey if you're planning to attend). Presentation: Power BI Automated Machine Learning…
Read article MS BI fans, join us for the next Atlanta MS BI and Power BI Group meeting on November 4, Monday, at 6:30 PM at the Microsoft office in Alpharetta. Stacey Jones will present Power BI options with Python. Accelebrate will sponsor the meeting. And I will share some tips demoing the latest Power BI Desktop features, such as the new ribbon, decomposition tree and AI integration. For more…
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