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V0016:
The specification states the following:
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Subclause 11.6, "<table constraint definition>": <table constraint definition> ::= [ <constraint name definition> ] <table constraint> [ <constraint characteristics> ] <table constraint> ::= <unique constraint definition> | <referential constraint definition> | <check constraint definition>
Microsoft SQL Server 2008 R2 and Microsoft SQL Server 2012 vary as follows:
Transact-SQL partially supports this feature.