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Efficient paging using SQL script

, 28 Dec 2011
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Hi, what about such solution?DECLARE @pageNumber INTDECLARE @rowsOnPage INTSET @rowsOnPage=5SET @pageNumber=2DECLARE @totalItemsToSelect INTSET @totalItemsToSelect=@rowsOnPage * @pageNumberSELECT TOP (@rowsOnPage) * FROM MainTrans WHERE ID IN( SELECT TOP...
Hi, what about such solution?
DECLARE @pageNumber INT
SET @rowsOnPage=5
SET @pageNumber=2
DECLARE @totalItemsToSelect INT
SET @totalItemsToSelect=@rowsOnPage * @pageNumber
SELECT TOP (@rowsOnPage) * FROM MainTrans WHERE ID IN
    SELECT TOP (@totalItemsToSelect) ID FROM MainTrans ORDER BY ID DESC
it looks much shorter.
P.S. of course this solution works only if you have identity column. in my opinion identity column is a must for paging, moreover this approach works for any database not only for MS SQL


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Comments and Discussions

GeneralReason for my vote of 4 I think this script works well, but ... PinmemberRobby Tendean28-Dec-11 16:12 
GeneralReason for my vote of 3 The alternative is pretty solid if y... PinmemberHelluin28-Dec-11 6:01 
GeneralActually: 1. TOP does not work on Oracle (at least versions ... PinmemberPablo Aliskevicius28-Dec-11 4:38 
1. TOP does not work on Oracle (at least versions 8 through 10, the ones I worked with).
2. The IDENTITY field is usually meaningless. For instance, in Robby's example, some user is paging by a date column; let's say that column is the birth date of a person; there is no guarantee that the records were created on a 'first born, first entered' order.
The ROWNUMBER function seems to be a lesser evil: another option would be getting all the relevant records into the client, and paging there.

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