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Key in Dataverse table

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Posted on by ladeedeee

I am trying to pass data from Project online to Dataverse using Dataflows. My idea is to have dataflows fill the dables in Dataverse, but also refresh - update those tables when i want. In order to not have duplicate records, i thought to create primary keys in Dataverse tables. So here comes the first question - why i dont get the Unique Identifier column as an option when choosing the column to be a key? Second question, i am trying to choose id of a certain record to be a key, and getting this error over and over:

"dataverse Exception output: System.Data.SqlClient.SqlException (0x80131904): The CREATE UNIQUE INDEX statement terminated because a duplicate key was found for the object name 'dbo.xxx_ProjectOnlineProjectsBase' and the index name 'ndx_for_entitykey_xxx_xxxProjectsKey'. The duplicate key value is <redacted>."

I do not have any other key created (duplicate), neither similar name, though i dont even understand what do they mean with this.

I would appreciate if anyone can advise me here, first: am i doing right thing, is this the right way to not duplicate records in Dataverse tables?, and second, what is this error about and what should i do?

Many thanks in advance!

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Microsoft Dataverse with Power Apps

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ChrisPiasecki 6,422 Most Valuable Professional on at

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Hi @ladeedeee,

The Id column of a table already is a primary key and unique. Using Alternate Keys is a way to enforce uniqueness on other columns or a combination of them, which is a composite primary key if you're familiar with SQL. This will prevent duplicates. Perhaps something like Project Name is a good candidate for a key if you know it's unique.

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todorovicdijana 15 on at

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Hi @chrisg , thank you for your reply
Yes, the id column is a primary column, but what i was trying to do is to create of it a Key (in Schema properties of the table). I did it in several other Datavarse tables, and in some of them i had this same errors appearing, while in others no. I always chose table specific id columns for creating a Keys, and in some tables they were part of composite keys, in some just one column key. As i tried to explain previously, when i select an option - create a Key, the Unique Identifier column - guid is not appearing as an option for selection among the olumns from the table, even though i found in documentation it is recommendable to use that one for the Key....
If i dont create a Key in Dataverse table, but consider that Id column already is a primary key, each time when i refresh Dataflow that transfers data from Project Online to that Dataverse table, data duplicates in the table, and that is the point, i need to be able to use dataflows for updating the tables and not duplicating data.
Does it make sense hat i am saying, i don´t know if i am clear enough? 🙂

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ChrisPiasecki 6,422 Most Valuable Professional on at

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Hi @ladeedeee,

I understand that alternate keys are required to ensure you can update records via Data Flows rather than creating new duplicate entries.

If I understand correctly, you are also saying that your unique column from your Project Online source is a Unique Identifier (GUID)? If so, then when mapping that Project Online Guid to Dataverse, it has to be a separate column that is not the same as the Dataverse table Id column. You'll want to create a single line of text column to represent your Project Online Id. Then create an alternate key based off that.

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