List tables that doesn't participate in any relationships ...

Posted Date: 03 Jan 2007	Resource Type: Articles	Category: Databases
Author: Vadivel Mohanakrishnan	Member Level: Diamond
Rating:	Points: 7

Introduction

This article helps in listing those tables which aren't participating in any relationships between other tables.

This query returns those tables which satisfy the below two conditions:

1. Tables that do not contain any Foreign Key referencing other tables.
2. Tables that are not referenced by other tables using foreign key constraints.

Solution:

Till SQL Server 2000 days we used to write the below scripts [This still works with SQL Server 2005 also].

Select [name] as "Orphan Tables" from SysObjects where xtype='U' and id not in
(
Select fkeyID from SysForeignKeys
union
Select rkeyID from SysForeignKeys
)

Solution which works only with SQL Server 2005:

Method 1:

Select [name] as "Orphan Tables" from Sys.Tables where object_id not in
(
Select parent_object_id from Sys.Foreign_Keys
union
Select referenced_object_id from Sys.Foreign_Keys
)

Method 2:

Select ST.[Name] as "Orphan Tables"
from Sys.Foreign_Keys as SFK Right Join Sys.Tables as ST
On ST.object_id = SFK.parent_object_id Or
ST.object_id = SFK.referenced_object_id
Where SFK.type is null

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