If excel school were to be a bar, this post is your last call. Come one, come all and order the course now.
Click here to sign-up for excel school
(on a lighter note, if excel school were to be a pie, we wouldn’t be having this conversation :P)
How many students have joined the school?
At the time of writing this post (Around 11pm on Feb 16) we have 94 students signed up. That is quite a bit more than what I expected. While I am a tiny bit scared, I am very keen to help as many more people as possible. So, go ahead and join the program, because I don’t know when I will re-open it.
Clarification about PayPal:
Few people have e-mailed me and asked, “I don’t have PayPal account, how do I sign-up?”.
Well, you don’t need a PayPal account if you use the one-time payment option. All you have to do is click on the link that says “Continue without creating a paypal account”. See this screenshot.
(You must create a PayPal account if you choose monthly payment option. This will give you ability to review your payment every month.)
When is it closing exactly?
I will be closing new registrations by 11:59 PM (Pacific Time) on today. Pacific time is GMT-8:00. See the below list to know when exactly the registration closes at your time zone.
Will the school re-open later this year?
That is my plan. But I don’t know if my kids permit me to fool around too much. You see, by then they would be talking.
So, Sign-up already!
Click here to sign-up for excel school
Bonus Excel Tip: How to convert times from one time zone to another?
Just because 100 people are joining excel school doesn’t mean that rest 7,900 of you should read a sales pitch. So here is a bonus tip.
If you want to convert times from one time zone to another (like above), you can use simple date arithmetic.
- Enter the date and time you want to convert in a cell (say in A1)
- Now, let us say you want to convert this to time zone 6 hours ahead of it.
- Simply write the formula
=A1 + 6/24to get the time in new time zone. - Hint: change
+6/24to-7/24if you want time in a zone that is 7 hours behind.
That is all. Happy time traveling.
PS: You would need a real time machine if you miss the dead line for excel school sign-up. You know what to do.
8 Responses to “Pivot Tables from large data-sets – 5 examples”
Do you have links to any sites that can provide free, large, test data sets. Both large in diversity and large in total number of rows.
Good question Ron. I suggest checking out kaggle.com, data.world or create your own with randbetween(). You can also get a complex business data-set from Microsoft Power BI website. It is contoso retail data.
Hi Chandoo,
I work with large data sets all the time (80-200MB files with 100Ks of rows and 20-40 columns) and I've taken a few steps to reduce the size (20-60MB) so they can better shared and work more quickly. These steps include: creating custom calculations in the pivot instead of having additional data columns, deleting the data tab and saving as an xlsb. I've even tried indexmatch instead of vlookup--although I'm not sure that saved much. Are there any other tricks to further reduce the file size? thanks, Steve
Hi Steve,
Good tips on how to reduce the file size and / or process time. Another thing I would definitely try is to use Data Model to load the data rather than keep it in the file. You would be,
1. connect to source data file thru Power Query
2. filter away any columns / rows that are not needed
3. load the data to model
4. make pivots from it
This would reduce the file size while providing all the answers you need.
Give it a try. See this video for some help - https://www.youtube.com/watch?v=5u7bpysO3FQ
Normally when Excel processes data it utilizes all four cores on a processor. Is it true that Excel reduces to only using two cores When calculating tables? Same issue if there were two cores present, it would reduce to one in a table?
I ask because, I have personally noticed when i use tables the data is much slower than if I would have filtered it. I like tables for obvious reasons when working with datasets. Is this true.
John:
I don't know if it is true that Excel Table processing only uses 2 threads/cores, but it is entirely possible. The program has to be enabled to handle multiple parallel threads. Excel Lists/Tables were added long ago, at a time when 2 processes was a reasonable upper limit. And, it could be that there simply is no way to program table processing to use more than 2 threads at a time...
When I've got a large data set, I will set my Excel priority to High thru Task Manager to allow it to use more available processing. Never use RealTime priority or you're completely locked up until Excel finishes.
That is a good tip Jen...