Comments on: How to find next and previous records in SQL http://www.xaprb.com/blog/2006/04/28/how-to-find-next-and-previous-records-in-sql/ Stay curious! Sat, 30 Aug 2008 04:28:43 +0000 http://wordpress.org/?v=2.2.2 By: Anthony http://www.xaprb.com/blog/2006/04/28/how-to-find-next-and-previous-records-in-sql/#comment-14522 Anthony Tue, 06 May 2008 18:22:34 +0000 http://www.xaprb.com/blog/2006/04/28/how-to-find-next-and-previous-records-in-sql/#comment-14522 To: soid Thanks! I see the problem. I think what I need instead of a LEFT JOIN, is a FULL OUTER JOIN. The corrected query would be... SELECT table.*, next.id AS next_id, prev.id AS prev_id FROM table FULL OUTER JOIN table AS next ON next.position > table.position FULL OUTER JOIN table AS prev ON prev.position < table.position WHERE table.id = ? ORDER BY position ASC, prev_id DESC LIMIT 1; Note: This is UNTESTED... To: soid

Thanks! I see the problem. I think what I need instead of a LEFT JOIN, is a FULL OUTER JOIN. The corrected query would be…

SELECT table.*, next.id AS next_id, prev.id AS prev_id
FROM table
FULL OUTER JOIN table AS next ON next.position > table.position
FULL OUTER JOIN table AS prev ON prev.position < table.position
WHERE table.id = ?
ORDER BY position ASC, prev_id DESC LIMIT 1;

Note: This is UNTESTED…

]]> By: soid http://www.xaprb.com/blog/2006/04/28/how-to-find-next-and-previous-records-in-sql/#comment-14521 soid Tue, 06 May 2008 14:06:56 +0000 http://www.xaprb.com/blog/2006/04/28/how-to-find-next-and-previous-records-in-sql/#comment-14521 To Xaprb I have MySql of 5.0.44 version and your method doesn't work. So I found the error when I make a query like this: SELECT t1, sign(t1-100), t1-100 FROM table And I received something like that: 98 | 1 | 18446744073709551613 99 | 1 | 18446744073709551612 101 | 1 | 1 102 | 1 | 2 ..etc.. So I solved the problem when I take off an "unsigned" flag for the id column (sh*t, MySql Query Browser uses it by default!). And so I see X-Crap has a similar problem when he creates table: CREATE TABLE `acores_imagens` ( `imgid` mediumint(6) unsigned NOT NULL auto_increment, To Xaprb

I have MySql of 5.0.44 version and your method doesn’t work. So I found the error when I make a query like this:

SELECT t1, sign(t1-100), t1-100 FROM table

And I received something like that:

98 | 1 | 18446744073709551613
99 | 1 | 18446744073709551612
101 | 1 | 1
102 | 1 | 2
..etc..

So I solved the problem when I take off an “unsigned” flag for the id column (sh*t, MySql Query Browser uses it by default!).
And so I see X-Crap has a similar problem when he creates table:

CREATE TABLE `acores_imagens` (
`imgid` mediumint(6) unsigned NOT NULL auto_increment,

]]> By: soid http://www.xaprb.com/blog/2006/04/28/how-to-find-next-and-previous-records-in-sql/#comment-14520 soid Tue, 06 May 2008 13:21:19 +0000 http://www.xaprb.com/blog/2006/04/28/how-to-find-next-and-previous-records-in-sql/#comment-14520 To Anthony Altemara Your query doesn't work if we use it for last element. Query returns just empty :-( To Anthony Altemara

Your query doesn’t work if we use it for last element. Query returns just empty :-(

]]> By: Anthony Altemara http://www.xaprb.com/blog/2006/04/28/how-to-find-next-and-previous-records-in-sql/#comment-14369 Anthony Altemara Sun, 30 Mar 2008 19:23:06 +0000 http://www.xaprb.com/blog/2006/04/28/how-to-find-next-and-previous-records-in-sql/#comment-14369 Ok... I'll try encoding the >'s and <'s.... SELECT table.*, next.id AS next_id, prev.id AS prev_id FROM table LEFT JOIN table AS next ON next.position > table.position LEFT JOIN table AS prev ON prev.position < table.position WHERE table.id = ? ORDER BY position ASC, prev_id DESC LIMIT 1; Ok… I’ll try encoding the >’s and <’s….

SELECT table.*, next.id AS next_id, prev.id AS prev_id
FROM table
LEFT JOIN table AS next ON next.position > table.position
LEFT JOIN table AS prev ON prev.position < table.position
WHERE table.id = ?
ORDER BY position ASC, prev_id DESC LIMIT 1;

]]> By: Anthony Altemara http://www.xaprb.com/blog/2006/04/28/how-to-find-next-and-previous-records-in-sql/#comment-14368 Anthony Altemara Sun, 30 Mar 2008 19:15:59 +0000 http://www.xaprb.com/blog/2006/04/28/how-to-find-next-and-previous-records-in-sql/#comment-14368 Darn! I swear I keep posting the complete query.... SELECT table.*, next.id AS next_id, prev.id AS prev_id FROM table LEFT JOIN table AS next ON next.position > table.position LEFT JOIN table AS prev ON prev.position Darn! I swear I keep posting the complete query….

SELECT table.*, next.id AS next_id, prev.id AS prev_id
FROM table
LEFT JOIN table AS next ON next.position > table.position
LEFT JOIN table AS prev ON prev.position

]]> By: Loughlin McSweeney http://www.xaprb.com/blog/2006/04/28/how-to-find-next-and-previous-records-in-sql/#comment-14367 Loughlin McSweeney Sun, 30 Mar 2008 18:53:46 +0000 http://www.xaprb.com/blog/2006/04/28/how-to-find-next-and-previous-records-in-sql/#comment-14367 Brilliant solution - clever SQL, very nice! Brilliant solution - clever SQL, very nice!

]]> By: Anthony Altemara http://www.xaprb.com/blog/2006/04/28/how-to-find-next-and-previous-records-in-sql/#comment-14252 Anthony Altemara Tue, 26 Feb 2008 18:10:45 +0000 http://www.xaprb.com/blog/2006/04/28/how-to-find-next-and-previous-records-in-sql/#comment-14252 correction on my last post... The query is incorrect. It will always return the first record as the prev_id... I had to add another ORDER BY on the end Here's the updated query: SELECT table.*, next.id AS next_id, prev.id AS prev_id FROM table LEFT JOIN table AS next ON next.position > table.position LEFT JOIN table AS prev ON prev.position correction on my last post… The query is incorrect. It will always return the first record as the prev_id… I had to add another ORDER BY on the end

Here’s the updated query:

SELECT table.*, next.id AS next_id, prev.id AS prev_id
FROM table
LEFT JOIN table AS next ON next.position > table.position
LEFT JOIN table AS prev ON prev.position

]]> By: Anthony Altemara http://www.xaprb.com/blog/2006/04/28/how-to-find-next-and-previous-records-in-sql/#comment-14251 Anthony Altemara Tue, 26 Feb 2008 17:40:21 +0000 http://www.xaprb.com/blog/2006/04/28/how-to-find-next-and-previous-records-in-sql/#comment-14251 I've done something similiar with: SELECT table.*, next.id AS next_id, prev.id AS prev_id FROM table LEFT JOIN table AS next ON next.position > table.position LEFT JOIN table AS prev ON prev.position < table.position WHERE table.id = 21 ORDER BY position LIMIT 1; I’ve done something similiar with:

SELECT table.*, next.id AS next_id, prev.id AS prev_id
FROM table
LEFT JOIN table AS next ON next.position > table.position
LEFT JOIN table AS prev ON prev.position < table.position
WHERE table.id = 21
ORDER BY position LIMIT 1;

]]> By: Almanca tercüman http://www.xaprb.com/blog/2006/04/28/how-to-find-next-and-previous-records-in-sql/#comment-14165 Almanca tercüman Tue, 15 Jan 2008 15:33:43 +0000 http://www.xaprb.com/blog/2006/04/28/how-to-find-next-and-previous-records-in-sql/#comment-14165 In which place? Can you rewrite the query or part of the query and get the same results? If it’s simpler, I’m all for it... In which place? Can you rewrite the query or part of the query and get the same results? If it’s simpler, I’m all for it…

]]> By: |X-Crap| http://www.xaprb.com/blog/2006/04/28/how-to-find-next-and-previous-records-in-sql/#comment-14115 |X-Crap| Fri, 28 Dec 2007 16:58:16 +0000 http://www.xaprb.com/blog/2006/04/28/how-to-find-next-and-previous-records-in-sql/#comment-14115 Argh.. the script cuts me alot of code.. Here is the really correct code i used: http://www.acores.net/code.txt Argh.. the script cuts me alot of code..
Here is the really correct code i used:

http://www.acores.net/code.txt

]]>