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I was recently helping a client determine tables in his SQL Server 2005/2008 which had Clustered Index but did not have any nonclustered index on them. I am sharing the query I tried out to achieve the same and will use the Northwind database as a sample to test the query on
SELECT obj.name as TableName
FROM sys.objects obj
INNER JOIN sys.indexes idx ON idx.OBJECT_ID = obj.OBJECT_ID
WHERE
(obj.type='U'
AND obj.OBJECT_ID NOT IN (
SELECT OBJECT_ID
FROM sys.indexes
WHERE index_id > 1)
AND idx.Index_ID = 1)
OUTPUT
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3 Responses to "Identify Tables that have Clustered index but no NonClustered indexes"I think you need to add the following filter to ensure that the results only include tables with clustered indexes.
AND idx.INDEX_ID = 1
Otherwise, the query includes tables that don't have a clustered index (INDEX_ID = 0 uses a heap).
Thanks Bob. Yes I missed out on that one and thanks so much for your suggestion. I have added that to the query
select name from sys.tables WHERE OBJECTPROPERTYEX(object_id,'TableHasclustIndex')=1 AND OBJECTPROPERTYEX(object_id,'TableHasNonclustIndex')=0
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