How to avoid row number() on query

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SQL-Server-2008R2

SQL

SELECT
    ROW_NUMBER() OVER (ORDER BY Item_ID) AS ROW_NUM
    ,I.[ITEM_ID]
    ,I.[ITEM_NBR]
    ,I.[ITEM_CATEGORY_ID]
    ,I.[ITEM_CATEGORY_NAME]
FROM INV_ITEM_MASTER as I

I have view query as above
however i found performance issue work with big data using that query cause by OW_NUMBER() OVER (ORDER BY Item_ID) AS ROW_NUM

any suggestion to avoid using row number as above?
cause i still need use it for paging

Posted 27-Jul-15 19:44pm

gunkrr

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Suvendu Shekhar Giri 28-Jul-15 2:07am

Check this article. Awesomely done.
A More Efficient Method for Paging Through Large Result Sets
Hope, you'll find it useful.

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Wendelius · Answer 1 · 2015-07-27T20:02:00

There are a lot of techniques how to implement paging. For example have a look at Paging of Large Resultsets in ASP.NET[^]

However, if that is the whole query you use, you seem to be missing boundaries for the fetch, so you select everything from the database and do the paging on client side. I believe that the query should be something like

SQL

SELECT TOP 10 a.* 
FROM ( SELECT ROW_NUMBER() OVER (ORDER BY Item_ID) AS ROW_NUM
              ,I.[ITEM_ID]
              ,I.[ITEM_NBR]
              ,I.[ITEM_CATEGORY_ID]
              ,I.[ITEM_CATEGORY_NAME]
       FROM dbo.zipcode ) a
WHERE ROW_NUM > @start_row_number