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A key field is typically a value that a user can enter and modify. For example, a product code from a products table. This constraint should ensure:
if the object is new, that the key value has not already been used in the table / table subset
if the value has changed, then the new value does not conflict with an existing value already in the table / table subset.
This constraint should encapsulate this concept and eliminate the need to repeatedly resolve this problem for different tables and scenarios.
if the value has not changed then the constraint passes
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