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export all data from one table to multiple text files

Posted on 2016-10-28
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Last Modified: 2016-10-31
I have one table and want to create multiple text files with 200 rows of data in each file. I used row number to get a unique id but not able to generate multiple text files.

ROW_NUMBER() OVER(ORDER BY id DESC)

How to use the row_number in my between clause?
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Question by:neehar gollapudi
  • 2
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Assisted Solution

by:Nakul Vachhrajani
Nakul Vachhrajani earned 1000 total points
ID: 41864583
You can't use a Windowing function in the WHERE clause because row numbers are given to rows as part of the SELECT, whereas the WHERE clause is evaluated in the initial stages of the query execution.

What you can do is implement a paging solution in a stored procedure/script (https://nakulvachhrajani.com/2016/02/08/0373-sql-server-interview-questions-parameters-required-for-server-side-paging-mechanisms/) and then export the output of each page into individual text files.
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Pawan Kumar earned 1000 total points
ID: 41864737
Try..Below code will give you number of records you want to fetch from each page.

--You can use below code

DECLARE @NoOfRecords AS INT = 200
DECLARE @WhichPage AS INT = 1


;WITH CTE AS
(
	SELECT * , ROW_NUMBER() OVER(ORDER BY id DESC) rnk
	FROM [yourtableName]
)
SELECT [cols...] FROM CTE
WHERE Rnk >= (( @WhichPage * @NoOfRecords ) + 1 ) AND RNK <= ( ( @WhichPage + 1 ) * @NoOfRecords ) 


--

Open in new window


Hope it helps !!
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Author Closing Comment

by:neehar gollapudi
ID: 41866853
Thank you Pawan and Nakul
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by:Nakul Vachhrajani
ID: 41866888
@Neehar,

Thanks for the points. Did you look at my solution? I proposed the same thing as Pawan with additional information (in my humble opinion) on why your code did not work and what can be used in case you migrate to SQL 2012.

If you are using SQL Server 2008 R2 or lower (which is not specified in the question), then the CTE method makes sense. If you are using SQL Server 2012 or higher, the OFFSET...FETCH is much better in terms of performance and helps overcomes some of the functional drawbacks of the conventional method.
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