Hello,

Datasets by default allow anywhere between one to three key columns depending on what the dataset is.

Typically the primary key columns are either:

- ParticipantId

- ParticipantId + Date (or VisitId)

- ParticipantId + Date (or VisitId) + a 3rd column of your choosing

More details here: https://www.labkey.org/Documentation/wiki-page.view?name=editDatasetProperties

Are the above options not suitable for your needs?

Regards,

Jon