[freetds] dbnextrow() vs dbskiprow() (skipping rows in FreeTDS)
Jason Young (Morgon)
morgon at mygamercard.net
Mon Jul 28 13:21:33 EDT 2008
Re-reading these posts, there's really little reason to not use ROW_NUMBER:
SELECT *
FROM (SELECT ROW_NUMBER() OVER (ORDER BY author [ASC | DESC]) as Row,
author, title, description
FROM books
GROUP BY author)
AS Results WHERE Row BETWEEN 51 AND 75
I know it may not seem intuitive for 'generic' queries (as the original
poster wanted), but there's only 'x' number of ways you'd want to sort
things ('x' = number of fields in the table, eh?).
Simply set a 'default' method of search (id?), and change the ORDER BY
clause if the user wants to sort by something else.
I know it's been easy to rely on MySQL to generically sort things for
you, but it's doing it based off of *something* that you can easily
re-create.
More info on what Navdeep meant by 'generic' might be more helpful.
David Barnwell wrote:
> You can page through MSSQL tables 20 rows at a time using this SQL:
>
> SELECT top 20 author, title, description FROM mytable
> WHERE table_id NOT IN (
> select top 12345 table_id from mytable
> order by title
> )
> ORDER BY title
>
> Here, table_id = primary key of the table
> 12345 = the next row to return (counting from 0)
>
> I wrote a data browser that allows the user to page through any table
> and see the first/next/last 20 rows. It's surprisingly fast - on a table
> with 344000 rows it can select the last 20 rows in about a second.
>
> -- David
>
> Navdeep Shergill wrote:
>
>> I am trying to implement a mysql like paging; and this is one approach that
>> I am looking at. Mysql makes it realy easy with the LIMIT keyword; but I am
>> not having such luck with MSSQL. I am currently looking at the ROW_NUMBER
>> function ; but even that one requires me to do a order by on some column.
>>
>> The problem is that the user may be trying to run some very generic queries;
>> and I need to be able to provide paging.. so I was looking at some way to
>> exec a query; and then go right to some arbitary row in the result set.
>>
>
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