# Difference between Use specific columns and Row ownership

**URL:** <https://community.glideapps.com/t/difference-between-use-specific-columns-and-row-ownership/32573>\
**Category:** Ask for Help\
**Created:** [October 2, 2021, 7:04pm UTC](https://community.glideapps.com/t/difference-between-use-specific-columns-and-row-ownership/32573 "2021-10-02T19:04:21Z")\
**Posts on this page:** 1\
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**Author:** ![nathanaelb](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/nathanaelb/32/43079_2.png) [@nathanaelb](https://community.glideapps.com/u/nathanaelb)\
**Post date:** [October 3, 2021, 9:40pm UTC](https://community.glideapps.com/t/difference-between-use-specific-columns-and-row-ownership/32573/8 "2021-10-03T21:40:44Z")

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**User-specific column (USC)**

- Personalization feature. _Component_ personalization feature.
- Is applied to a basic column. Affects the attribute (column) of a list item, therefore a component.
- Personalization of a component that all users see.
- A specific item attribute (column) becomes personalizable, item by item (=row by row).
- Example: 1-to-5 star ratings (⭐). If _you_ rate a restaurant 4⭐, _I_ might rate it 5⭐. Attribute personalization. Imagine that a cell in your table (Rating column of Restaurant ABC) is replicated like mirrors facing in an elevators. And this for every item on your list.
- USC creates cell depth.

**Row owners**

- Security feature. Performance feature. _List_ personalization feature.
- Is applied to a column with email addresses. Affects list items (rows).
- Sub-lists of an entire list in your table are created. A sub-list is created based on the sub-list belonging to an email address (=user).
- Security: user A cannot see user B’s sub-list and user B cannot see user A’s sub-list.
- Performance: user A’s data is not downloaded to user B’s device, so less data is downloaded to devices, so performance improves.
- Example: The app contains a table called “restaurants”. Row owners is active. You add items restaurant A, B, and C to the list. I add restaurants D, E and F. (Regardless of USC which would apply to components) I will never see restaurants A, B and C in the app and you never D, E and F. Sure the app is personalized, but in a list level: we don’t see the same list items.
- Row owners (and “roles” for that matter) create row ownership (and ownership to a group or category of owners in the case of “roles”).

I hope this is clear enough and I didn’t make any mistakes.

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