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SQL Server FAQ - CREATE INDEX - Adding an Index on an Existing Table

By: FYIcenter.com

(Continued from previous topic...)

How To Create an Index on an Existing Table?

If you want to an index on an existing table, you can use the CREATE INDEX statement in a simple syntax:

CREATE INDEX index_name ON table_name (column_name)

The tutorial exercise below shows you how to add an index for the "in" column of the "fyi_links" table:

USE FyiCenterData;
GO

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

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

-- Create an index for "id"
CREATE INDEX fyi_links_id ON fyi_links (id);
GO

-- Create an index for "url"
CREATE INDEX fyi_links_url ON fyi_links (url);
GO

(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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