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Message Posted: Thu, 08 Mar 2012 @ 16:50:51 GMT

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The other responses are correct, but I prefer to explain it from a slightly different point of view:

If the partitioning column(s) are not part of the Primary Index, then you cannot declare the PI as UNIQUE.

In this case, if you need to enforce a uniqueness constraint on the PI columns, then you must add a USI with the same columns as the PI.

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