# Create recommendation list

**URL:** <https://community.glideapps.com/t/create-recommendation-list/62036>\
**Category:** Ask for Help\
**Created:** [May 23, 2023, 2:19am UTC](https://community.glideapps.com/t/create-recommendation-list/62036 "2023-05-23T02:19:21Z")\
**Posts on this page:** 1\
**Showing post:** 22

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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:** [May 24, 2023, 12:57pm UTC](https://community.glideapps.com/t/create-recommendation-list/62036/22 "2023-05-24T12:57:10Z")

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I thought we solved that issue in your earlier question related to this App?

> [@Add row only if it does not exist](https://community.glideapps.com/t/add-row-only-if-it-does-not-exist/61728):
>
> In one table I have a list of book selections by readers. Each row represents a book and a user. When multiple user select the same book, there are multiple rows added. Works fine. I have created a roll-up table that counts how many times each book is in the books table. I cannot figure out how to add the book to the roll-up table at the same time it is added to the books table without creating redundant rows in the roll-up table. The logic would be something like, “if book already exists …

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_[View the full topic](https://community.glideapps.com/t/create-recommendation-list/62036)._