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select Nth row from table

Posted on 2002-05-10
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Last Modified: 2008-03-06
I have a table with a billion rows
id (primary key, identity), email, firstname, etc...

I want to grab a specific row number, but the id's have gaps (from deleting rows)

my first attempt:
select top 1 * from mytable e where (select count(id) from mytable where id <= e.id) = 412

that would return the 412th row regardless of gaps in id.. the problem with that query is its sooo slow!

can anyone help me with a better solution?

maybe a better idea would be to re-index the table whenever a row is deleted but I could not figure out how to do that either (without making a temporary table) BTW: no temp tables.. the table is toooo BIG to be duplicated
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Question by:gfody
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3 Comments
 
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Accepted Solution

by:
Scott Pletcher earned 800 total points
ID: 7002151
If you're going after a relatively low-numbered row, such as 412, this should work OK:

SELECT TOP 1 *
FROM
(SELECT TOP 412 *
FROM myTable
ORDER BY id) AS topOfMyTable
ORDER BY id DESC
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Expert Comment

by:Scott Pletcher
ID: 7002159
Naturally you will need an index on id (as the first/only column in the index) for this to run efficiently.  You should probably remove it from the other index unless it's needed there to specify order.

Also, since the TOP clause will not accept a variable, with this method you would have to use sp_executesql or EXEC('SELECT ...') to make the row number dynamic.
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Author Comment

by:gfody
ID: 7002321
thank you, this is much faster
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