# Composite Key - How come Glide is missing this
**URL:** https://community.glideapps.com/t/composite-key-how-come-glide-is-missing-this/72681
**Category:** Ask for Help
**Created:** [April 18, 2024, 4:12am UTC](https://community.glideapps.com/t/composite-key-how-come-glide-is-missing-this/72681 "2024-04-18T04:12:13Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Bubble](https://community.glideapps.com/u/Bubble)
#### Post date: [April 18, 2024, 4:12am UTC](https://community.glideapps.com/t/composite-key-how-come-glide-is-missing-this/72681/1 "2024-04-18T04:12:13Z")
I want my students to be enrolled in the class
My table Enrollment with following fields (Student No + Class Section+ Academic Year ) should be unique. But the System is allowing duplicates.
How to have Unique Entry.
This is common feature is applied across all kind of App. How come still Glide is not included this feature
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### Author:  [@Jeff\_Hager](https://community.glideapps.com/u/Jeff_Hager)
#### Post date: [April 18, 2024, 4:43am UTC](https://community.glideapps.com/t/composite-key-how-come-glide-is-missing-this/72681/2 "2024-04-18T04:43:35Z")
> [@How do I create a custom form?](https://community.glideapps.com/t/how-do-i-create-a-custom-form/25014):
>
> I’m just dropping this here so I have something to refer people to when they ask. This is a simple concept app (copyable), that demonstrates the following techniques: Building custom forms for adding and editing list items (as an alternative to the native forms provided by Glide) Preventing duplicate new entries using [User Specific Columns](https://docs.glideapps.com/all/reference/data-editor/user-specific-columns) and [Relations](https://docs.glideapps.com/all/reference/data-editor/computed-columns/relation-column) Enforcing mandatory input items The use of visibility conditions and user specific booleans to control user flow There is nothing particular…