# Summarize math column

**URL:** <https://community.glideapps.com/t/summarize-math-column/63156>\
**Category:** Ask for Help\
**Created:** [June 26, 2023, 9:01am UTC](https://community.glideapps.com/t/summarize-math-column/63156 "2023-06-26T09:01:40Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Andreas\_Ramelsberger](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/andreas_ramelsberger/32/52780_2.png) [@Andreas\_Ramelsberger](https://community.glideapps.com/u/Andreas_Ramelsberger)\
**Post date:** [June 26, 2023, 9:01am UTC](https://community.glideapps.com/t/summarize-math-column/63156/1 "2023-06-26T09:01:40Z")

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Hey all,

I want to summarize working ours. And normaly I would use the rollup function.  
But it does not work for math columns. Any ideas?

Best  
Andi

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**Author:** ![Darren\_Murphy](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/darren_murphy/32/47326_2.png) [@Darren\_Murphy](https://community.glideapps.com/u/Darren_Murphy)\
**Post date:** [June 26, 2023, 9:21am UTC](https://community.glideapps.com/t/summarize-math-column/63156/2 "2023-06-26T09:21:50Z")

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Can you show me the column that you want to rollup?

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<div class="post-metadata">

**Author:** ![Andreas\_Ramelsberger](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/andreas_ramelsberger/32/52780_2.png) [@Andreas\_Ramelsberger](https://community.glideapps.com/u/Andreas_Ramelsberger)\
**Post date:** [June 26, 2023, 9:33am UTC](https://community.glideapps.com/t/summarize-math-column/63156/3 "2023-06-26T09:33:37Z")

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![Bildschirm­foto 2023-06-26 um 11.33.07](https://us1.discourse-cdn.com/flex002/uploads/glideapps/original/3X/8/e/8ec573c622874de4010bd753a8a3786c911b0029.jpeg)  
hier schicke ich dir die spalte

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<div class="post-metadata">

**Author:** ![Darren\_Murphy](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/darren_murphy/32/47326_2.png) [@Darren\_Murphy](https://community.glideapps.com/u/Darren_Murphy)\
**Post date:** [June 26, 2023, 9:46am UTC](https://community.glideapps.com/t/summarize-math-column/63156/4 "2023-06-26T09:46:05Z")

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Okay, so have you tried rolling up that column?  
It should work.

Personally, I would use a Math column to calculate elapsed minutes between two date/time values:

```auto
 Trunc(End-Start*1440)

```

…but either way it should work.

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<div class="post-metadata">

**Author:** ![Andreas\_Ramelsberger](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/andreas_ramelsberger/32/52780_2.png) [@Andreas\_Ramelsberger](https://community.glideapps.com/u/Andreas_Ramelsberger)\
**Post date:** [June 26, 2023, 10:17am UTC](https://community.glideapps.com/t/summarize-math-column/63156/5 "2023-06-26T10:17:57Z")

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it does not work! Do you know why

 ![Bildschirm­foto 2023-06-26 um 12.17.41](https://us1.discourse-cdn.com/flex002/uploads/glideapps/original/3X/5/b/5bba33f116e66895d25a7097cb8179fd9b1692b6.jpeg)

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<div class="post-metadata">

**Author:** ![Darren\_Murphy](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/darren_murphy/32/47326_2.png) [@Darren\_Murphy](https://community.glideapps.com/u/Darren_Murphy)\
**Post date:** [June 26, 2023, 10:28am UTC](https://community.glideapps.com/t/summarize-math-column/63156/6 "2023-06-26T10:28:33Z")

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ah, I see. You are trying to rollup a computed column in a Big Table.  
That is not supported.  
What you will need to do is calculate the difference in minutes when the row is created/updated, and then enter that as a non-computed column value. Then you will be able to do the rollup.

A list of all current limitations of Big Tables is given below:

> **[Glide • Big Tables](https://www.glideapps.com/docs/reference/data-sources/big-tables#limitations-of-big-tables)**
>
> Scale your app with up to 10 million rows of data.

_ps. yes, I know the doc doesn’t currently list this specific limitation, but it will be updated soon_

_pps. Doc has been updated 😉_

 ![CleanShot 2023-06-26 at 19.01.55@2x](https://us1.discourse-cdn.com/flex002/uploads/glideapps/original/3X/2/9/292ae655ec86b427e66567878c45bec661e962bd.jpeg)