Can we add Index on nvarchar (MAX) column in Sql Server 2005

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SQL-Server-2005

Hello Everyone,
Today I read somewhere that using index means improving your application performance.
It sounds great but I stuck in simple problem.

I have 1 Column which has nvarchar(MAX) datatype and contains around 30k records.
Records are already sorted in ascending.

I tried to put index by using Indexing dialog. but I didnt find out nvarchar column. I got only columns which has integer as datatype.

1) Does indexs support NVARCHAR datatype?
2) Do I really need to add index on column which is already sorted?

Regards
Rohit More

Posted 19-Nov-13 1:29am

Rohit More

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RedDk · Accepted Answer · 2013-11-19T08:06:00

First the data (already sorted? I doubt it), anyway ...

CREATE TABLE [cpqa].[tbl_RM_maxNvarchar](
	[data][nvarchar](323)
	)
INSERT INTO [cpqa].[tbl_RM_maxNvarchar]
	VALUES('transworldairlines')

Now the target for an indexed version of that "sorted" table.

CREATE TABLE [cpqa].[tbl_RM_maxNvarcharX](
	[x][int]IDENTITY(1,1),
		[data][nvarchar](323)
		)
INSERT INTO [cpqa].[tbl_RM_maxNvarcharX]
	SELECT * FROM [cpqa].[tbl_RM_maxNvarchar]

Execute this query:

SELECT * FROM [cpqa].[tbl_RM_maxNvarcharX]

And get this result:

x   data
~~~~~~~~~~~~~~~~~~~~~~~
1   transworldairlines

And finally sort using ORDER BY [x] ASC.