[Column name] execute_as_principal_id [Description] ID of the database principal under which the context execution occurs, as specified by the EXECUTE AS clause of the CLR function, stored procedure, or trigger. NULL = EXECUTE AS CALLER. This is the default. ID of the specified database principal = EXECUTE AS SELF, EXECUTE AS user_name, or EXECUTE AS login_name. -2 = EXECUTE AS OWNER. [Data type] 
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