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Find circular references in single table

By Eugene Bereznuk,

The objective is to find circular references in a single table related to itself. The script deals with a sample table Skills that have a SkilGUID (primary key) field and a SkilParentGUID field which is a foreign key to the record's parent from the same table. The number of levels in the hierarchy is not limited. Of course, the highest object in a hierarchy will have NULL in ParentGUID field. Here the datatype for GUIDs is uniqueidentifier but it may as well be an int or whatever.

The script is rather straightforward and simple - it just returns the GUIDs engaged in circular references. Of course it may be enhanced in many possible ways.

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