Web Reference: Nov 18, 2025 · In SQL Server, a user can only view the metadata of securables that the user owns or on which the user has been granted permission. This means that metadata-emitting, built-in functions such as TYPE_ID may return NULL if the user does not have any permission on the object. Apr 26, 2016 · system_type_id is not unique in sys.types because user types can reuse system type. To get a list of unique system types, you can select rows where system_type_id = user_type_id. In its entirety you can do: from sys.columns c. INNER JOIN sys.types t. ON t.user_type_id = c.user_type_id. As a side note, in SQL Server the system tables are deprecated (i.e. syscolumns, sysobjects) and it's recommended as a best practice to use the views instead, sys.columns, sys.objects, etc.
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