Question

My page looks like:

| << back button | IMAGE | forward button >> |

Every row have an unique ID number, and with that ID I’m getting result from my data base.

The << back button is a hyperlink, and it should contain the previous row ID. The forward button >> should contain the next row ID.

The ID column has INTEGER values with AUTO_INCREMENT.

How I should wrote my query? Can I use negative values? Something like:

SELECT * FROM `db` ORDER BY `ID` DESC LIMIT -1, 1

Does it work?

Answer 1

You can’t use negative values, but you can use your current id in the WHERE clause to find values less than it, order by ID DESC and limit to 3. The auto_increment id column is sorted in descending order, so the first 3 values that are less than your currently selected id will be targeted.

SELECT * 
FROM `db`
WHERE `ID` < [your_current_id]
ORDER BY `ID` DESC
LIMIT 3

Likewise to get the next three, use > and sort in ascending order.

SELECT * 
FROM `db`
WHERE `ID` > [your_current_id]
ORDER BY `ID` ASC
LIMIT 3