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$0I see a flaw with the example query. When joining sys.default_constraints to sys.columns, the example only joins ON parent_column_id = column_id but this causes an issue when there are column_id(s) in sys.columns that overlap the column_ids in the sys.default_constraints values for the given table. This can be resolved by joining also on d.parent_object_id = c.[object_id]:$0
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$0SELECT d.definition FROM sys.default_constraints AS dINNER JOIN sys.columns AS cON d.parent
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