Context Transition in DAX/Power BI: A Visual Guide
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- čas přidán 8. 08. 2017
- Context Transion can be frustrating for a new PowerBI user. Definitions for it seem quite simple, but understanding how it works can be quite difficult. In this video we're going to walk you through the step by step mechanics of how Context Transition can taken a broken formula and bring it to life. All in a nice easy to comprehend visual way.
- Věda a technologie
Awesome video. I've been working with DAX for 3 years and this is the first time I feel I've really understood how context transition works. I've gone through the Definitive Guide to DAX and Building Data Models with Power Pivot and neither one provides an explanation as clear as in this video.
I concur! Shame this guy does not have enough subscribers. He is a hidden gem on CZcams. I'm subscribing
By far the most detailed and clear depiction of context I've seen. You don't let any assumption go unchallenged, which I appreciate. Many other videos assume I already understand some aspect of a formula (when I don't).
This is by far the best video on context transition. You are an incredible teacher. You broke this down without any assumptions and in a step-by-step fashion. Please do like a proper dax and power bi course and not just private lessons. Thanks a lot. I need to reiterate again, you are an excellent teacher.
NOTE: The Canada value is wrong for anyone wondering. It should be 15.
Congratulations Brian. I have read/watched many books/articles/blogs/courses/videos on this subject but have never been that comfortable with the concept until now. Thanks!
Excellent video. Even after reading many books I was not very clear on this concept. Your simplified explanation showed the inner workings of the calculation. Thank you so much for sharing your knowledge.
I have read numerous books and watch numerous videos but not even a single source has broken this concept to this level. AWESOME!
I have looked into tons of videos and vlogs on context transition but this is the only one that makes any sense to me. Thanks!
I've watched 2 videos but already LOVE this channel!!!
Hi Brian,
Thanks for nice video!
I have one question in bad function why "CAN" value is showing 23. As i am new in DAX , i think it should be 15.Please explain
Regards
Nitin Verma
Amazing Stuff Right Here! This is the first time I have understood context transition completely!
I love that you showed these concepts in excel. I've read the dax guide Bible, took the video course, and still learned something from this video. Creating a bucket of the filter context and 'promoting' row into filter context was a great visual for me. Thanks!
great visual explanation, I've really understood how context transition works
Excellent video. Left a detail comment in the row vs filter Context video. Thanks for the exceptionally well done video.
Brian, this is the best explanation I have got on this subject. Read a few pages on a book but couldn't figure it out. Thanks
I am so glad I ran across this video. Great explanation of context transition using calculate. Super clear and helpful approach to thinking about what's going on. Like others have said, I read a lot and watched a lot of videos on this topic but this is by far the best explanation I have found. Great job. I'm now a subscriber. Thanks.
Excellent video. Simple and clear step-by-step explanation. Thanks!! Please continue.
Great Demonstration and explanation of Calculate and why it is necessary to use. I am sure this will clear confusion up for many. I doubt I could have explained why (especially to someone else) before seeing this video. Also explains why measure branching (using measures in other measures) works -- because of the change in context. Great Job!
One of the best explanation on Context Transition I have seen yet.
Once again, Brilliant stuff, very well designed and explained.
This is a GREAT way to learn. Keep them coming, please!!!!
WoW... I don't even remember how many times I have tried to understand this concept by referring to various links... even from the experts. However, this one video is the only thing required to understand the DAX pattern/behavior around context transition.
I am surprised to see only 1.9K followers even after 10K views on this video.
I immediately followed the channel with a hope to learn more in future. I can clearly understand the amount of effort that the trainer has put in to walk through this concept with so may different sheets in excel each having a new step/explanation on this topic.
Finally some light over this grey area. Context transition has never been explained so visually. I"ve been using DAX for 3 years now and was still clueless on this topic. Thumbs up :-)
Brilliant explanation - first time I feel like I've really understood the concept.
Excellent explanation!! Thank you! This helped me to get a better understanding of the existing contexts.
Thanks a lot for Putting this Video .very crisp and clear , i have gone through many books and videos to understand this topic and i can say finally this video made my day . much appreciated
Excellent video, explaining step by step like peeling off an onion layer by layer, crystal clear 😍😍
I have watched about 10 videos on Context Transition on CZcams and this video is by far the clearest explanation of this topic. To explain a difficult topic in an easy to understand manner is no easy task and most videos that I've seen miss that point. However, this 30 minutes will be well worth your while investing in learning about Context Transition with a brilliant explanation and visual guide. Thank you for this tutorial!
thank you so much for your work, we really needs these deep-dive visuals to learn DAX more absorbable
okay I'm learning Dax and I just wanna say thanks, I was so confused but this was really helpful, I might go back and watch your entire series
Best explanation ever of Context Transition in DAX!
Good stuff. Really appreciate your polite handholding in understanding this.
The visualization of context transition is fantastic. Really enjoying your videos.
Thanks! Glad you liked it!
Excellent video. Interesting evolution through sheets. Congrats.
Superb video. Best 30 mins of my DAX study
Great content as always Grant!! Thank you.
Thank you for making this explanation! This video is absolutely helpful.
Wow! One of the best explanations I have seen.
Thanks a lot brain, finally i understood exactly what context transition is ... rally thanks. God bless you.
Saved for future reference and to help others. Thank you
Hi Brian, Best ever video on context transition
Great work, Brian!
Thanks for this explanation. Ive been working with power BI since 2017 and this is a great explanation. I truly don't understand why microsoft has not tried to build similar videos to explain this complexity. They've got documentation but it just doesn't translate for the majority of users
Thank you for this video! I found it extremely helpful.
Thank you, Brain for the explanation. It does make sense!
Absolutely Brilliant! thanks for sharing such amazing content
Why haven't I seen this video before. Superb!
This is great. Does an excellent job of simplifying a concept that was making my brain hurt. It still hurts, but at least now it somewhat understands why it hurts.
This is great explanation thanks a lot for the good work! keep it up!
I couldn't to be more thankful for your great work!
In fact, one thing which I didn't get my head around is WHAT'S THE EVALUATION CONTEXT FOR A NESTED FUNCTION CALL, like SUMX inside MAXX in your video.
Great many thanks to your in-depth illustration, this issue wouldn't haunt me any more, I hope.
Thank you so much for your amazing explanation!
A lot of work goes into making these but hearing that it's helpful for people really does make it all worth it!
Thank you Brian G! You're like the blonde ale I'm drinking, crisp and clear. I've gone through several literature on this topic but was always confused up until now. Or maybe it's the alcohol instead?
Best explanation really! Thank you
Many thanks for this video!
But should the bad Canada total be 15?
Yes and and the bad total should be 38. Anyway, it is a good explanation of the topic, we can disregard this small mistake.
what a great explanation :):):)
Hey Brian! I am enjoying watching the series you created. Your teaching style is by far one of the best that I came across on You Tube regarding DAX. Dou have any book that you deeply dive into all the DAX concepts?
"Muito obrigado" from Brazil!
Excellent!!! Very very GOOD!!!
Thanks very much! Glad you enjoyed it :-) I've turned on subtitles though it looks like Google only wants to translate to English. Maybe that's just on my machine. I dunno if I can get the time to write a closed caption metadata file by hand, though if someone wanted to send me an audio recording with translation (and me quieter in the background as reference), I'd be happy to work it in using Premier. (If that someone were to be in Portland I'll even help record it :-) )
Awesome dude, thanks
many thanks, great video
Quick question, Brian: isn't the amount for Canada in the Bad column wrong? Using the flow you've presented which makes perfect sense, shouldn't it be 15 though?
Hey Adi, you're totally correct, great catch! I try and proof these things but mistakes do tend to slip through on occasion. I've updated the values in the follow along workbook. Hope it was helpful otherwise!
CSG Pro, it was extremely helpful, actually by following what you've taught us I ended up discovering the mistake because I tried replicating the thinking for Canada. Therefore without your lesson I wouldn't have found it. Thank you, sir!
PS. Grand total is 38 also as it runs the engine with no filtering, therefore adding everything, isn't it?
Exactly :-) The Filter Context starts empty (which in the absence of slicers and report filters is what Grand Total really means), then stays empty the entire time because CALCULATE() never gets used to promote/transition each "customer"'s Row Context into the Filter Context for any of the sale table calls. Hence each call to the sale table brings back the entire thing; hence the sum of amt's then is just ALL sales. Very glad to be of help!
Noticed the same thing, glad for pointing it out
Great content, just a tip, would it be possible to add a comment to that section of the video, just to highlight that value is not correct. I actually got distracted from your brilliant video trying to find out why that value for CAN is 23 as well :)
Awesome video. won a subscriber
Great video -Thanks,
The end examples starting at 26mins would have benefited from visuals showing the filtering IMO. Excellent video and hope you do another on the end DAX examples.
You are a genius !!!
Again an excellent video explanation!!! I would be so great to get the link of the workbooks you used for your videos.
Thanks for watching! Here's this workbook. The other will follow shortly.
1drv.ms/f/s!AqxW-T1EoGfY-SkGgIE8uDPsdbr-
Excellent
THANK YOU!
Thank you so much
must watch for everyone who try to understan this topic
Interesting technical approach with a lot of sheets for every step 😂
Maybe it would be easier to use white boxes over next elements, and to unhide them with VBA, or object selection window.
Cheers
Really good.
What a legend ❤
Great!
Hello Brian - This video was by far excellent explaining the concepts of Context transition, and thank you very much for graphical representation, that really helped to get the concept drive home. I have one question though on the measure. Instead of Maxx, if we would have gone through Max(Cust, Sumx(Sales,Price+0)), would there be any difference ?
great present but following your explanation I dont think we can get CAD/BAD = 23. Should they be 15 instead ?
Great explanation. Thanks for providing the workbooks to download (see comment by TheCric1 and reply).
Hello, I have done the exercise with the measure LY Sales BadA of the sheet D19B and I've taken the job of doing something similar to what you've shown :-)). Only for study purposes, I would like to ask if you can review it to be sure if I have understood it well. Regards.
I cant believe this video is for free :D
I will promote this channel
Hi
Can one explain about the sentence which he was telling that measures are always wrapped with calculate then why didnt the measure give corrct result
bad=MAXX(cus(sumx(sales,salesamt+)))
Following the logic of the bad calculation, shouldnt the bad calculation for Canada display 15?
thank you
For CAN, I tried to visualise the same way as USA. We have only 1 row in 'cus' table and 2 rows in extended 'sales' table, both good and bad results should be 15 right?? How come the final result of yours says 23 for good when it's CAN? Could you please explain?
27:15 any advice on where to deep dive why MAXX on the other side of the Boolean operator is not affected by FILTER(ALL(),) ? Thanks for a great video btw!!!
Hi, Joshua.
As shown and narrated at 7:20, another function call doesn't get affected by the the row context unless an explicit CALCULATION call.
Hope this might be of some help.
Hi guys,
Great video, it really made a confusing concept simple.
One thing that I am still unsure about. Does context transition only apply when using a calculated column given it doesn't have a filter context?
On the contra, does context transition therefore not apply in measures because you always have a filter context (even if blank) so applying a CALCULATE() in a measure doesn't impact the calculation with respect to context transition?
Cheers
KC
Shouldn't the cell in the bad column and the CAN row have the value of 15? It's just the USA one that returns the wrong result but Canada doesn't because there is only one person from Canada.
thanks for help mein brazil.
How is it possible that there is a 23 and 23 for "bad measure"? Even if this is not correct, incorrect values should be 15 and 23?
What software do you recommend to shoot videos like this one?
thank you
Camtasia
Thinking how CANADA got 23 instead 15?
Why using Maxx in the date table? Max(Date[Year]) is enough, no?
I found the screen text too small to follow along. It would be great if you could zoom in relevant areas of worksheet as you explain.
Hey Sandip; I definitely hear you; I went the static route because I thought it'd make it easier to not get lost in the "where are we in the overall screen" and make sure if people's eyes want to pop back and forth between other bits of data that nothing was ever obscured on the screen. I may try and rerecord with some zooming to see if that works better. If you haven't, be sure to select 1080 as the viewing resolution in the bottom right corner of the screen; that helps a ton. Thanks for watching!
It is best viewed in HD resolution.
May I have the excel file ？
I think my comment is trivial and a tad late but the bad formula for CAN should evaluate to 15, not 23. The grand total should evaluate to 38.
Sorry, there goes the link with the work book. jmp.sh/6E1idsK
It would be good if you activate the subtitles in Spanish. Thank you.
It would be good if you activate the subtitles in Spanish or English Thank you.
Hey Eladio, I'm not sure why CZcams automatic captions have not processed for this video. I have reset the language to English, so hopefully they should be up in the next couple days. I will check in later this week to see if they went through. Thanks for your interest!
Hola Eladio, no estoy seguro de por qué los subtítulos automáticos de CZcams no se han procesado para este video. He restablecido el idioma al inglés, así que espero que estén listos en los próximos días. Me registraré a finales de esta semana para ver si pasaron. ¡Gracias por tu interés!
I have over 700 followers on LinkdIn and I will promote this video!
Brian, this is the best explanation I have got on this subject. Read a few pages on a book but couldn't figure it out. Thanks
This Video is really good. I wish I found this video earlier.