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SQL Server FAQ - CREATE CLUSTERED INDEX - Adding Clustered Indexes

By: FYIcenter.com

(Continued from previous topic...)

How To Create a Clustered Index?

If there is no primary key in a table, you can add one clustered index to that table with CREATE CLUSTERED INDEX statement. The tutorial exercise below shows you how to create a clustered index:

USE FyiCenterData;
GO

-- Drop the old table, if needed
DROP TABLE fyi_links;
GO

-- Create a table with primary key
CREATE TABLE fyi_links (
  id INT,
  url VARCHAR(80) NOT NULL,
  notes VARCHAR(1024),
  counts INT,
  created DATETIME NOT NULL DEFAULT(getdate())
);
GO

-- Create a clustered index
CREATE CLUSTERED INDEX fyi_links_url ON fyi_links (url);
GO

-- Create a non-clustered index
CREATE INDEX fyi_links_created ON fyi_links (created);
GO

-- View indexes
EXEC SP_HELP fyi_links;
GO
index_name         index_description               keys
-----------------  --------------------------      ----
fyi_links_created  nonclustered located on PRIMARY created
fyi_links_url      clustered located on PRIMARY    url

(Continued on next topic...)

  1. What Are Indexes?
  2. How To Create an Index on an Existing Table?
  3. How To View Existing Indexes on an Given Table using SP_HELP?
  4. How To View Existing Indexes on an Given Table using sys.indexes?
  5. How To Drop Existing Indexes?
  6. Is the PRIMARY KEY Column of a Table an Index?
  7. Does the UNIQUE Constraint Create an Index?
  8. What Is the Difference Between Clustered and Non-Clustered Indexes?
  9. How To Create a Clustered Index?
  10. How To Create an Index for Multiple Columns?
  11. How To Create a Large Table with Random Data for Index Testing?
  12. How To Measure Performance of INSERT Statements?
  13. Does Index Slows Down INSERT Statements?
  14. Does Index Speed Up SELECT Statements?
  15. What Happens If You Add a New Index to Large Table?
  16. What Is the Impact on Other User Sessions When Creating Indexes?
  17. What Is Index Fragmentation?
  18. What Causes Index Fragmentation?
  19. How To Defragment Table Indexes?
  20. How To Defragment Indexes with ALTER INDEX ... REORGANIZE?
  21. How To Rebuild Indexes with ALTER INDEX ... REBUILD?
  22. How To Rebuild All Indexes on a Single Table?
  23. How To Recreate an Existing Index?

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