# Create a cumulative chart using 'Group by'

**URL:** <https://forum.bubble.io/t/create-a-cumulative-chart-using-group-by/161280>\
**Category:** Need help\
**Created:** [July 23, 2021, 2:48pm UTC](https://forum.bubble.io/t/create-a-cumulative-chart-using-group-by/161280 "2021-07-23T14:48:47Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![ohyoonkwn](https://sea1.discourse-cdn.com/bubble/user_avatar/forum.bubble.io/ohyoonkwn/32/76883_2.png) [@ohyoonkwn](https://forum.bubble.io/u/ohyoonkwn)\
**Post date:** [July 23, 2021, 2:48pm UTC](https://forum.bubble.io/t/create-a-cumulative-chart-using-group-by/161280/1 "2021-07-23T14:48:47Z")

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Hi there…

I’m trying to plot a cumulative graph of the number of content uploaded by users per certain period.

I thought it can be done by using Group by expression. but I’m not getting it correctly.

I used Sum in aggregation. but the chart looks very odd.

 ![Screen Shot 2021-07-20 at 13.54.51](https://us1.discourse-cdn.com/bubble/original/3X/1/2/1270be5586430e7cffa6f4388dbd7b7e1f08e125.png)  
 ![Screen Shot 2021-07-20 at 13.55.04](https://us1.discourse-cdn.com/bubble/original/3X/a/9/a91cc1e78339dc2b38a084ec19b2d86ba684c3af.png)

 ![Chart data example](https://us1.discourse-cdn.com/bubble/original/3X/0/f/0f5150ffc92b7c392e990d4f357ff17dc2f0d632.png)

Someone could give me some hint on what to look for?

Thanks!  
Ohyoon

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**Author:** ![Andrew.Vernon](https://sea1.discourse-cdn.com/bubble/user_avatar/forum.bubble.io/andrew.vernon/32/80954_2.png) [@Andrew.Vernon](https://forum.bubble.io/u/Andrew.Vernon)\
**Post date:** [July 24, 2021, 5:48pm UTC](https://forum.bubble.io/t/create-a-cumulative-chart-using-group-by/161280/2 "2021-07-24T17:48:58Z")

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Hey @ohyoonkwn👋

Thanks for the post and sorry for the trouble with this! We might need a little more info to be able to make a helpful recommendation here. For instance, it looks like you’re grouping by a date field that is different than the date fields you have highlighted in the screenshots you shared. And it’s hard to tell from the screenshots what data types those are and how they relate to the dynamic expressions you have in the first screenshot.

Feel free to shoot us an email at [Support@Bubble.io](mailto:Support@Bubble.io) with some more details and we’d be happy to get you pointed in the right directly.

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**Author:** ![system](https://us1.discourse-cdn.com/bubble/original/3X/2/8/2847faa74692c2ffa5d939d3dc3724cdd060d247.png) [@system](https://forum.bubble.io/u/system)\
**Post date:** [October 1, 2021, 2:49pm UTC](https://forum.bubble.io/t/create-a-cumulative-chart-using-group-by/161280/3 "2021-10-01T14:49:39Z")

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Closed on October 1, 2021, 2:49pm UTC

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