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Add unique constraint to nullable relationship in CDS

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Posted on by KoJaPD

601

Hello,

How can I create a unique constrain on a relationship?

In SQL I Would do something like

CREATE UNIQUE NONCLUSTERED INDEX 
 idx_TableAID_Unique_notnull
ON 
 TableB(TableA_ID)
WHERE
 TableA_ID IS NOT NULL;

I have been looking at Business Rules, but I can't find a way to choose a unique check.

Thanks,

Koen

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Microsoft Dataverse with Power Apps

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Hamish Sheild 3,005 Most Valuable Professional on at

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Hi @KoenJanssensPD ,

I don't understand the SQL query you posted but if you are looking to make sure that a look-up field on an entity contains a unique value then you can use Alternate Keys in CDS.

Here are a couple of links
https://docs.microsoft.com/en-us/powerapps/maker/common-data-service/define-alternate-keys-reference-records
https://docs.microsoft.com/en-us/powerapps/maker/common-data-service/define-alternate-keys-portal
Alternate Keys are primarily designed for assisting with integrations with other systems but one of the features of alternate keys is that they ensure uniqueness and will pop up a message to the user if they try and enter a value into a field that is not unique throughout the CDS.

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