Question

My code get the last 10 values from a table. This table has te structure id,text and by the moment it has 20 rows. I use this piece of code

<?php
$query = mysql_query("SELECT * FROM `table` ORDER BY `id` DESC LIMIT 10");
// Fetching data stuff here
?>

and it returns the data for IDs 11-20. (The last 10 of the 20)

I want to get the previous 10 values from this 1-10 via AJAX. I thought maybe this will work

$previous_id= $_GET["last"];  // This time it will be 11
mysql_query("SELECT * FROM `table` ORDER BY `id` DESC LIMIT $previous_id, -10");

But I’m doesn’t, any suggestion?

Thanks

PS: This is not a gimme teh codez question, I just want to know how to make that query work.

Answer 1

If I understand you correctly you want to get the 10 rows before the row with id = $previous_id, ordered by descending ID.

If that’s the case your best bet would be to use a WHERE condition. As you are ordering by id DESC you want the first 10 rows with id > $previous_id:

SELECT * FROM `table` WHERE `id` > $previous_id ORDER BY `id` DESC LIMIT 10

These will be the 10 rows before $previous_id in your original query.