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I need to create a unique primary key on multiple columns.  I have tried to do it in the tables create statement and that works, however if
I do it in an alter table she seems to moan?  I am running version 3.25.

Here is the code which I am having some trouble with:

e alter table EstimateAttributeValue
    add UNIQUE PRIMARY KEY (estimateId, attributeId)
 
this works if I leave the unique out, but then I can insert duplicates. Is there a cleaner alternitive than creating a unique index on
the same column as the primary key?

if possible could you please send some sample code to do this.

Thank you kindly

Jon