We got 500+ tables and want to identify which tables doesn't have primary keys. Because creating index on large table will help to improve performance.
Required Command - to identify table which are HEAPS (as they dont have clustered index)
Regards
Asked
Active
Viewed 9,445 times
5
-
A PK can be a `CLUSTERED` or `NON-CLUSTERED` unique index. So, you can have tables with PK but without clustered index. – Bogdan Sahlean Sep 28 '11 at 10:10
1 Answers
4
SELECT OBJECT_NAME(object_id)
FROM sys.indexes
WHERE index_id=0
AND OBJECTPROPERTY(object_id, 'IsUserTable') = 1
Finds all heaps. This issue is orthogonal to whether or not a PK exists though. A heap can have a non clustered PK and a clustered index isn't necessarily the PK. To find tables without a PK you can use.
SELECT *
FROM sys.tables t
WHERE NOT EXISTS
(
SELECT *
FROM sys.indexes i
WHERE is_primary_key=1 AND i.object_id = t.object_id
)
Martin Smith
- 438,706
- 87
- 741
- 845