Do yourself a favor: Watch this, from 28:00 minutes in, to the very end.
If my calculations are correct, when this baby hits 88 miles per hour… you’re gonna see some serious s#!t.
Do yourself a favor: Watch this, from 28:00 minutes in, to the very end.
If my calculations are correct, when this baby hits 88 miles per hour… you’re gonna see some serious s#!t.
…that is the question.
Heck, never mind PowerBI…I’ve only recently started using PowerPivot and PowerQuery. (Not because I’m a slow adopter mind, but rather because the places I’ve been working have been slow adopters.) And yet here I am considering waging war on a new front entirely. Will PowerBI let me make considerable further gains without imposing considerable future cost to my organization’s long-term budget? Or can a large part of what PowerBI offers be achieved at much lower cost using my modern version of Excel, in conjunction with models and dashboards being built by my colleagues using the SQL Server stack – technology we already own?
On that first point, I found Matt Allington’s post Which To Use – PowerBI Or Excel? immensely helpful. On that second point, being a purely Excel guy, I’ve never learned much more about SQL Server other than how to write TQSL queries to get the data I need into a PivotTable. I’ve often heard other MS SQL Server terms such as SSRS, SSAS, and SSIS bandied around by IT types, but they have never really meant anything much to me, and so have always gone over my head. I’m just an Excel guy, after all. So here I come along talking about this thing called PowerBI that can be used to easily share data and insights, and my colleague doing stuff in the SQL stack says “Hmm…sounds awfully like this SSRS/SSAS/SSIS thing that I’m using. Compared to SSRS/SSAS/SSIS, what exactly *is* PowerBI?”
Not being an expert in either product, I couldn’t answer. So I did the next best thing: got the boss to pay for getting it certified on our IT system, and then got it installed on all my unit’s PCs, so that she could find out, and then explain it to me. It took my colleague just 5 minutes to understand what PowerBI is…or in her words:
OMG. I know what this PowerBI thing is. It’s easy.
So there’s your answer: PowerBI is much easier and quicker than developing in the SQL Server stack. But of course, while you can easily develop reports using the completely free client tool (i.e. PowerBI Desktop), you’ve still got to share those reports with end users. So what does that cost? $9.99 per user per month, regardless whether that user is a Rob Collie/Matt Allington type, or the cleaner (and I’m not talking about Harvey Keitel here). Yup, everybody has to have the pro license in order to consume shared reports, regardless of whether they are star developers, or occasional peekers.
That $9.99 per user per month is incredible value if you’re providing dashboards with the kind of people like us: Folk who put the ‘intelligence’ in Business Intelligence’. But that is pretty expensive across a whole bunch of non-self-service BI types, who only want to look at things occasionally that are already filtered to show only what is relevant to them. And who perhaps only glance at a handful of reports, a handful of times per year. So it’s hard to justify an organisational roll-out at great cost of a promising new technology. Currently, I can produce and distribute on-demand static reports for these folk for free, using Excel, VBA, and Outlook. When you don’t intend to click on filters, a PDF will work just fine.
This left me puzzled as to how to justify a much easier development tool to the bean counters. Quite coincidentally, yesterday MS announced the release of their PowerBI Premium plan. I thought this might help the business case for our organisation, but unfortunately it offers even worse value for mid-sized organisations than the $9.99-per-month flat rate that I’ll already struggle to get across the line with. Under the premium plan, you still pay that the $9.99-per-month flat rate for each developer, as this gives them the pro version of PowerBI that they need to create shareable reports. But in addition you also effectively buy a lump of capacity on a reporting server (either on premise or in the cloud) big enough to handle the load from servicing the demands of the folk actually consuming these reports. But those lumps are pretty big: they come in $60,000-per-year clumps. Yikes!
You can take a look at the pricing via Microsofts online calculator here. Here’s a cut-down view of how it looks:
Let’s look at the default view shown in the calculator above: An organisation of 5000 users, 20% of which are pro, 35% ‘Frequent’, and the remaining 45% ‘Occasional’. MS estimate the number of nodes you’d consume given this mix is 3, at $4,995/Node/Month. When you do the math, 45% of that $25k total is due to the Pro User licesces, and the remaining 55% is effictively the cost of sharing the reports with the wider organisation.
The bottom line here is that:
I agree with Matt Allington’s excellent post-mortum of this pricing announcement that while this might offer better value for very large customers, it’s completely unaffordable for medium-sized organisations. The middle guy is left out in the cold.
So how do MS work out the number of nodes you’re likely to need, given your Total User count and the split between user types? I did a bit of reverse engineering to determine that Microsoft’s calculator is based on:
Note the disclaimer from MS below the calculator: This calculator provides a rough and conservative estimate based on simple usage logic. Actual needs to support a given workload could significantly vary based on data models, data volumes, number of queries and their complexities, refresh rates, usage distribution and pattern changes over time, and other factors. This estimate should be regarded only as guidance and is not providing any guarantee of performance.
With these node calculations in hand, I rolled my own calculator, using Excel. Try it out in the web app below. (Orange cells are input cells).
So will we proceed down the PowerBI path? Maybe. But I’m tempted to stick with my current ‘old-school’ approach of building Dashboards in Excel, and then using VBA to automatically filter them, PDF them, and email them to the cleaners. Rather than being taken to the cleaners, courtesy of Microsoft’s licensing.
Next week, seven world-leading Excel MVPs – or The Seven Samurai, as I like to call them – are heading to Sydney and Auckland to show you how to slice your Excel data like never before. They’ve already massacred Melbourne. They’ll be butchering Brisbane between Wednesday 4th – Thursday 5th May. Then storming Sydney on Mon 8 – Tuesday 9 May. And then they annex Auckland later that same week, between Thursday 11 – Friday 12 May. If you want to catch them on tour, then here’s a link to all you need to know.
What’s that? Haven’t seen the movie, and want to know what you’re letting yourself in for? Well, here’s a brief plot synopsis:
The year is 2017. It is the agile period of Excel history. Our saga follows the story of a remote village of accountants who hire seven Dēta Ronin (masterless data Samurai) to combat bad practices that threaten to steal the accountant’s productivity after the next financial quarter.
Just look at them. Smiling assassins, the lot of them. God help the accountant that doesn’t do exactly what they say.
I saw a similar movie this time last year: The Dirty (Excel) Dozen. I laughed. I cried. I pivoted. I *power* pivoted. Heck, I even power-queried, power-BI’d, and power-networked. And learnt some stuff that saved me so much time back at work that now I can fill in the hours between hitting Refresh and hitting Refresh again with power-naps. I came out much better off. (And because I went last year, I also get a 30% discount this year. You can too, if you went last year).
This latest release is clearly targeted at the accountant market. Now I’m no accountant, but I’m going anyway, and perhaps you should too – regardless of whether you are an accountant or something sexier. After all, it’s not your money we’re spending here…it’s the divisional Training Budget. And we all know that if you don’t spend the Training Budget in full this year, you’ll get a smaller Training Budget to not spend next year. So you owe it to your division to spend it on something. And that something should be on Excel productivity, not some touchy-feely soft-skills finishing school crap. So literally take one for the team, and ask your boss for the readies and the release time today.
Now, if the boss is a bean-counter, you might need to put some fluff around that request. So let’s pretend we *are* accountants just for a moment, and see how the business case stacks up: We’d be getting 19 CPD hours (whatever the hell they are) just from sitting there behind our quiet accountant personas, plus we’d get to learn all sorts of accountanty stuff about Excel, PowerQuery, PowerPivot, VBA, and PowerBI from the aforementioned Samurai. Case closed.
Now snap out of it. We’re bean drinkers, you and I. Not bean counters. So we’re going for other reasons that the boss need not be burdened with. I don’t know about you, but I’m going because Auckland is 643.3 kilometres away from my day job in Wellington. Meaning I get to spend two full days NOT looking at the crappy spreadsheets I’ve spent the last few months developing. Not to mention that this 643.3 km learning mecca is in a northerly direction, away from the Antarctic ice caps and permanent hurricanes. Yup, it’s respite care, Excel conference style. Far away from the Excel hell that I find myself immersed in, today. Oh, and while I’m up there, I’ll be attending Ken Puls’ presentation on Making your data mobile with PowerBI at the Auckland PowerBI User Group. Maybe I’ll see you there, too.
You can find their bios here, if you speak fluent accountant. I’ve translated it into Jeff-Speak for the rest of us.
Liam Bastick, an experienced modeller. What kind of modelling, his bio doesn’t elaborate on. But I’m thinking underwear. Which is good, as I too like to build financial models about the apparel industry.
Chandoo, who like many other global superstars before him only needs one name. Although I’m not sure Chandoo will actually be able to make it: His sense of direction is pretty questionable. Just look at that background…does that look like New Zealand to you? Not even close, buddy.
Roger Govier, who no doubt will be packing his red jersey and perhaps overstaying his tourist visa in the vane hope that he’ll see some of his Welsh compatriots finally trounce the All Blacks at the upcoming Lions tour of New Zealand. (The last time being when I was born. I’m now 46. *Sniggers*)
Jon Peltier, who in this photo is saying ‘chart’ instead of ‘cheese’. (I plan to teach him how to say “Good Chart” in Maori. He loves ka pai charts)
Ken Puls, who in this photo is saying ‘C’mon and take the damn photo already, data monkey. It’s the little button on the left. No, my left’.
Mynda Treacy, who put the ‘dash’ in ‘dashboard’ with her one hour webinars.
I’m glad that Auckland is the last stop of their southern hemisphere tour. By then, they will have (no doubt) got their presentations down pat, (hopefully) will have their Dutch-courage-driven drinking under control, and probably abandoned attempts to peek up each other’s kimonos. But it’s not just these Samurai that I’m looking forward to heckling. There’s going to be some folk from the Microsoft Mothership there as well. Here they are, consuming some ‘old-school’ data, the Excel 2003 way:
You going? Give me a shout out in the comments, and we’ll CONCATENATE. You thinking of going, but haven’t quite committed? Shout out below anyway, and perhaps one of the Samurai will drop by and talk you around. Probably at knifepoint.
Do you live in Wellington, practically *live* in Micosoft Excel, day in, day out, and want an opportunity to pick up tips, tricks, hacks, and code from other Excellers? Have some tricks of your own to pass on? Need a second opinion on an approach you’re taking with a spreadsheet, or help untangling the monster mission-critical minefield of an XLSX file you just inherited?
If so, then boy do I have a group for you: I’ve just set up a dedicated Excel-focused meetup group at http://www.meetup.com/Wellington-Microsoft-Excel-Meetup/ that is just itching for folks like you to join. This Excel-centric group will pretty much cover the spectrum in terms of Excel’s incredibly deep functionality: Formulas, Tables, PivotTables, Charting, PowerPivot, PowerQuery, VBA, spreadsheet auditing and optimisation, dashboarding tips, information visualisation , the works.
I’m in the process of securing a venue for the first meetup, so expect to see more details soon. (And if you can help out with a venue, let me know).
At the same time I’ve come across Phil Seamark’s PowerBI group that has its first meetup on Wednesday at TradeMe. See http://www.meetup.com/Power-BI-User-Group-Wellington-NZ/ for details). No matter where your interest lies on the Excel/PowerPivot/PowerBI spectrum, between us we’ll have you covered. (I’ll be at the PowerBI event on Wednesday night at Trademe, and would love to see you there.)
So regardless of whether you’re a VLOOKUP virgin, or a VBA Virtuoso, a PivotTable pariah, or a PowerBI Professional, between these two groups we’ll have community led content, comment, and camaraderie relevant to you, your job, and your career.
So what are you waiting for? Sign up TODAY()
At first I wasn’t going to. I live in Wellington, which is 636 km to the south. (395 miles, to those of you in the dark ages). And this being Middle Earth, to get there by road I would have had to run the gauntlet of Goblins, Orcs, and cliche tourists like Zack Barrasse likely driving on the wrong side of the road as he heads to Hobbiton behind a grin bigger than one face could safely hold:
(Don’t get me wrong…the traffic south of Auckland is not without its own challenges):
And then there’s the whole “Paying for Excel feels a little like the concept of paying for sex…I’m good enough at it these days that I really shouldn’t have to” thing. (Excel, that is.)
But then I read the program. And there is truly something for everyone. Even me, who’s a virtual demigod at it compared to the poor suckers around me who don’t use it at all and have no desire to start now. Not to mention the outstanding cast. These guys and gals are like the Dirty Dozen:
Or at least, they would be, if there were one more of them. Oh wait, look: there’s two more of them below. Okay, so they’re like the Dirty Baker’s Dozen, then.
Those two extras are a couple of guys called Yigel Edery and Ben Rampson from the Excel Project Team. These guys think they’re here to discuss the future of Excel. But I still live in the past – along with 99% of the rest of us – so I’ll make sure they find some time to answer all my tricky questions, like “How ’bout refreshing the Conditional Formatting Dialog. Have you ever had to actually use it yourselves? Huh? Huh?” …and… Where the hell are my Dynamic PivotTable References already? We’ve got ’em for Tables, but not for PivotTables. Have you ever tried to integrate PivotTables into a formula-driven spreadsheet? Huh? Huh? …and… Why does every ‘new’ Excel feature have the prefix ‘Formally Known As’? Have you ever tried to write a book about characters that kept changing their names half-way through? Huh? Huh?
Boy do I feel sorry for those guys: They’ll be dead keen to talk about the new extensions, while I’ll be dead keen to point out that the stairs that lead to them still are a little unsafe to use. Let’s hope they’re still smiling like that when they get back on the plane.
I’ll also get to meet this guy, Ken Puls, …who wrote the most useful Excel blogpost ever in the history of most useful blogposts ever on the strength of it’s excellent existential first line alone: Do you know why you are here? He’s moving on to something more future focused in his presentation: Do you know where you are going? (A little place called PowerQuery apparently, located in the hip new suburb of Get and Transform.) Can’t wait, because I know zipcode about it.
And following straight on from that, I’ll either get to meet the Myth-Buster shown left, or the Chart-Buster shown right. (Apparently speakers are provisional and may change.) At least one of those guys needs no introduction: He’s Jon Peltier, and he’s a regular addition to my Google Search Terms whenever I try to squeeze out a good chart. And I owe him an entire beer of gratitude thanks to the best macro I never paid for. He’s going to pick up where Ken left off: Using Ken’s Powerquery data to build a Dashboard.
I also finally get to meet Bill Jelen. I’m gonna ask him nicely to autograph my stack of Excel books…even the ones he didn’t write. (He didn’t write like 0.01% of them, so it won’t take him long).
The only problem is that Bill’s talk coincides with another from Ken on PowerQuery. Damn. But maybe I’ll just have to skip Ken’s sequel, because Bill’s gonna dive deep into Data Visualisations (yes, it’s spelt with an s down here), Conditional Formatting, and PivotTables.
And of course, Zack isn’t here merely to look down Hobbits’ holes. He’s also here to talk about Tables, and perhaps to drink me under one afterwards.
And I’m super-excited to be meeting Charles Williams, who’s like the Phar Lap of Fast Excel. The Edmund Hillary of Excel’s capillaries. The Ernest Rutherford of Excel under-the-hood. If you’ve got spreadsheets that take about as long to open as the running time of your average installment of The Hobbit, then you need to read this, and then you need to come meet this guy.
And that’s just a select few of the wizened, Excel-scarred faces that I’ll see there. There’s a whole bunch of other international stars and local heroes coming too (including from that sleepy continent-sized Island that lies to the West of New Zealand) that I just can’t wait to INDEX and MATCH.
So yes, I’ve got my ticket. And I suggest you get yours pronto, because – as we say down here – it’s going to be O for Owesome.
You going? Give me a shout out in the comments, and we’ll CONCATENATE. You thinking of going, but haven’t quite committed? Shout out below anyway, and perhaps one of the Dirty Baker’s Dozen will drop by and talk you around.
I’m in the final stages of coding up a commercial add-in that gives you lot more filtering options for PivotTables at your fingertips than you get out of the box. Here’s how it looks, along with the PivotTable its connected to and a native Slicer for comparison:
As you can see, it offers you a lot more tricks than a native Slicer – including a nifty ‘Invert Filter’ function. It also lets you see a lot more items displayed in it compared to a Slicer: 22 items are visible in mine, vs just 17 in the correspondingly sized Slicer. And that’s one of the many beefs I have with Slicers…they take up far too much screen real estate for the scant options they offer. In fact, my version takes up no screen real-estate most of the time: it launches simply by double-clicking the PivotTable field header, and you can dismiss it when you’re done to free up space if you want:
So about that Invert Filter function. I love clicking on that sucker over and over again. It takes about 7 seconds to invert my sample PivotTable that has 1000 items in it (12 items of which are selected in this example). That’s actually pretty fast as far as inverting a PivotTable, because you need to change the .visible status of all 1000 PivotItems, and as per a previous post that’s very slow to do unless you get tricky. And 7 seconds is a vast improvement on the method Microsoft gave you…none. I can’t comprehend why simple options like these are not built in to Slicers and Tables, but your filtering pain is (hopefully) my financial gain. (Yep, this works on Tables too.)
Beautiful: 7 seconds, and she’s turned completely inside out. Unless that is, that Slicer happens to be selected. Then it takes a full minute. Why? No idea. Moral of the story: if you’re writing code to filter PivotTables, then you probably want to make sure any Slicers for that field are deselected first. Not disconnected…you can leave ’em in place quite happily, and the code won’t suffer.
Anyways, that’s the first look at my new baby. It does a lot more than just this inverting trick, too. Among other tricks, it lets you filter PivotTables based on external ranges, and gives you some absolutely fantastic new tools for filtering PivotFields based on just about any tricky search conditions you might want to string together – but that’s a subject for my next post.
I’ve been playing around with ListBoxes recently. Or more to the point, they’ve been playing around with me. After much staring and swearing, I’ve found that you can’t get a ListBox to repaint itself when feeding it an entire list in one go in response to a Listbox_Click event in that same ListBox. It does however repaint correctly if you run the exact same code from somewhere else…say a CommandButton-initiated action.
By new list, I’m talking about populating the ListBox with an array via the Listbox.list=SomeArray approach. The .AddItem method works fine. So there’s always that: you can simply remove all items one by one, then add all the new items one by one. But that’s really slow: on my laptop it takes something like 15 seconds to add 10,000 items to that listbox. And it gets slower the more you add. And you can probably double that, if you need to replace each and every one of those items with something else. Whereas the Listbox.list=SomeArray approach takes less than a second to add ten times as many items. It’s fast.
So why would you want to add tens of thousands of items to a ListBox? And why would you want to perform a wholesale update that list by clicking in the Listbox itself? Here’s why: I’m designing a UserForm to help filter PivotTables. It’s a cross between the existing Pivot Filter functionality and a Slicer. Here’s what you see if you double-click on a PivotField header:
Note the Search field at the top, and the three buttons immediately below that search field. If you type something into that field, then instead of displaying everything that’s currently filtered, you instead get a list of any matches, and you can then apply those search results to the underlying PivotTable via those three CommandButtons. The first cb simply filters the PivotTable to reflect the search, and the other two let you add or remove any search result from an existing filter. (The native filter lets you add, but not remove).
I want to do away with those three command buttons, and instead (in the event that a search is performed) simply list those three options at the top of the ListBox above any search results returned. Clicking on those three options will then trigger the exact same code as currently triggered by the Command Button.
Here’s how that looks currently if I actually type something in that Search box (Note I haven’t yet removed the three command buttons this new functionality will make redundant from that Search frame):
I’ve added a simple bit of code to the lbResults_Change() event handler that checks if a user clicks any of those first three options. All that code does is trigger the exact same routines as would be triggered if they’d simply clicked on the actual command buttons themselves:
For i = 0 To 4 If Me.lbResults.Selected(i) Then Exit For Next i Select Case i Case 0: cmdApplySearch_Click Case 1: cmdAddToFilter_Click Case 2: cmdSubtractFromFilter_Click Case 3: Me.lbResults.Selected(3) = False End Select
The listbox gets updated just fine if I click on the command buttons, as you can see from the below. The Pivot has been filtered accordingly, and those contextual search options have been removed from the top of the listbox (and the search field cleared):
But watch what happens if I trigger the exact same code by clicking that first option in the ListBox itself:
As you can see from the above screenshot, it still shows those three options at the top, even though they are NOT in the array that I assigned to the listbox, as evidenced by the screenshot below:
The Listbox DID get updated, mind:
? .ListCount 3 ? .List(0) 263213: ICT Systems Test Engineer ? .List(1) 263299: ICT Support and Test Engineers nec ? .List(2) 839313: Product Tester
…It just didn’t get redrawn. And it won’t get redrawn unless I refill the ListBox via one of those CommandButtons I’m trying to do away with. And it doesn’t seem to matter if I set the focus to the CommandButton before I try to refresh the Listbox, or even clear the ListBox entirely before I try to refresh it.
You can see this behavior for yourself in this sample file I’ve prepared.
When the userform opens, you’ll see this:
Clicking the CommandButton correctly loads a new array into the ListBox (and increases the size of the ListBox accordingly):
…but if you click in the ListBox itself – which triggers the exact same code – then while you’ll see that the ListBox got expanded, it did not get redrawn:
Just as weird: you can see that the ListBox got expanded by two lines. That’s because the ListBox_Click event got executed twice…even though I have the requisite event suppression code in place (and I’m not talking about application.enable events here, because that doesn’t work for UserForm events). Putting a breakpoint in the code also shows that the 2nd time it runs occurs immediately after the previous run finishes, and not as a response to the .list = SomeList bit that normally triggers such repeat runs.
And if I now click that CommandButton, you can see that the missing numbers from the double ListBox_Click pass are in fact there, as well as the extra addition from the latest CommandButton_Click:
If I click that Use .AddItem Approach radio button and then click in the ListBox, things go according to plan:
So there’s always that approach. But that approach sucks. Maybe I’ll be forced to keep those CommandButtons in the UserForm after all. Anyone else experience this issue, or have a workaround up their sleeve?
Further to my previous post on Goto Special/Blanks, it looks like there is a pretty serious problem with the SpecialCells method if you use it on more than one column.
That’s because it’s blindingly fast at finding things in one column, but painfully slow in finding things in any other columns. Which is a problem, because anyone who’s anyone knows that using SpecialCells is supposed to be much more efficient than looping through a big range. Well, Mr and Mrs Anyone may want to reconsider using the loop on multiple columns. Or rather, they might want to consider looping through the columns, and use SpecialCells on each one individually. Best of both worlds.
So how fast is it on one column? And how slow on multiple columns? Let’s find out.
Here’s your test code.
Dim TimeTaken As Date
Dim rng As Range
Dim Jeff As AboveAverage
TimeTaken = Now()
Set rng = Range(“A:B”)
TimeTaken = Now() – TimeTaken
Debug.Print “UsedRange:” & vbTab & ActiveSheet.UsedRange.Address
Debug.Print “Range Searched:” & vbTab & rng.Address
Debug.Print “Time Taken:” & vbTab & Format(TimeTaken, “HH:MM:SS”) & ” seconds.”
Debug.Print “Cells: ” & Selection.Cells.Count & vbNewLine & vbNewLine
Fill A:A with some text, such as “Blindingly Fast”, and run that sub. Here’s what I get:
Range Searched: $A:$B
Time Taken: 00:00:00 seconds.
Now fill B:B with “Painfully Slow”, and run it again. Here’s what I get:
Range Searched: $A:$B
Time Taken: 00:02:02 seconds.
What the…? So it took a blindingly fast 1 second to process one column, and a painfully slow three minutes to process two? That’s about as linear as my life story before I met and married Excel 2000. (My first wife. I still see her round from time to time in the forums. She hasn’t aged gracefully.)
So either there’s something SpecialCells doesn’t like about the number of columns, or there’s something it doesn’t like about the number 1048576. Let’s find out.
If you delete rows 524288 down, then you’re left with 2 columns of text totaling 1048576 cells. Here’s what I get if I run the code on that:
Range Searched: $A:$B
Time Taken: 00:00:57 seconds.
It took one minute to process this, as opposed to the one second it took to process the same amount of cells in one column. So it seems that it’s the multiple columns aspect that is causing the issue, and that the extra time incurred is dependent on the number of cells in that 2nd column. In fact, if I fill those blank cells in column A with our text (while leaving half of Column B with blanks) and rerun the code, then it doesn’t take Excel any longer to process those extra half million cells:
Range Searched: $A:$B
Time Taken: 00:00:52 seconds.
So it seems the issue is in how Excel is handling the union of all those cells it identified in the first column with any cells it identifies in the second. And given how slow it is, I wouldn’t be surprised if it’s unioning those cells one at a time.
The same thing goes for blanks, by the way. This turned up in the comments of Doug Jenkin’s latest post.
Moral of the story: Do NOT use SpecialCells on more than one column at a time.
Question: How are you supposed to bring this stuff to MS’s attention, apart from posting it somewhere conspicuous like here?
Over in the comments of his blog, Doug Jenkins hypothesizes:
A possibility is that a single column is treated as being a single array with 1 million values, but two columns are treated as being 1 million arrays, each with 2 values. When the operation is done on the spreadsheet with F5-Special, the name box shows that it works row by row, rather than all of Col A then all of Col B.
I think he’s right. And also after further testing, I realize that those times are down to how long Excel took to search all these arrays, and not to do with how long it took Excel to union the results. Because there weren’t that many results to union in my simple example, so it took practically no time at all.
But if you set up the data like so:
…then you see that the actual unioning takes a heck of a lot longer than the searching. For instance, as per above it took nearly two minutes for SpecialCells to search 1 million rows across two columns and identify a handful of blank areas. Whereas from the below table, you can see that with the greatly increased number of blanks that it’s got to union, it took over two minutes to union just 45,000 cells in one column.