To check that it cannot be repeated, how should it be set?

[11166]

Ask the teacher
If you want to add data to the attachment, please use [DATE]+[AREA] + [[NAME]
To check that it cannot be repeated, how should it be set?
Thank you, teacher

[Steve]

Answered here:

Check that it cannot be repeated, how should it be set? Questions

In the Valid If for the NAME column: ISBLANK( FILTER( "Participants", AND( ([_THISROW].[DATE] = [DATE]), ([_THISROW].[AREA] = [AREA]), ([_THISROW].[NAME] = [NAME]) ) ) - LIST([_THISROW]) )

[11166]

When selecting data in the NAME field …
Only the same data as the AREA field can appear!
Thank you

[11166]

Trouble teacher help
Thank you

[Steve]

Please clarify. Is there a problem? If so, please restate the problem you need help with.