Question

I have been attempting to reorder a table in a database based on category and order id for a menu structure.

This is what I have roughly as a table structure

menuid menuname      order categoryid
--------------------------------------
1      firstitem       1      1
2      seconditem      2      1
3      thirditem       1      2
4      fourthitem      2      2

I have tried this syntax:

UPDATE yourtable SET id=IF(id=2, 3, 2) where id in(2,3)

like this:

UPDATE menu
SET order = IF(order = `3`, `2`, `3`)
WHERE order = `3`

I am getting this error:

You have an error in your SQL syntax; check the manual that corresponds to your
 MySQL server version for the right syntax to use near 'order = IF(order = `3`, `2`, `3`)
 WHERE order = `3`' at line 2

Solution code:

UPDATE menu
SET `order` = case when `order` = 3 then 2 else 3 end
WHERE `order` = 3 AND section = 2 OR `order` = 2 AND section = 2

Answer 1

try

UPDATE menu
SET `order` = case when `order` = 3 
                   then 2 
                   else `order` 
              end

By the way order is a reserved word in MySQL. You have to escape it with backticks