Можно ли отсортировать список и сохранить порядок в одном обновлении?
Я пробовал этот способ:
UPDATE `jos_vm_category`,(SELECT @row:=0) AS init SET @row:=@row+1, list_order=@row ORDER BY `category_name` ASC
, но получил ошибка:
1221 - неправильное использование UPDATE и ORDER BY
If it's not clear, I need this:
category_id | category_name | list_order
3 | A | 1
1 | B | 2
2 | C | 3
from this:
category_id | category_name | list_order
1 | B | 1
2 | C | 2
3 | A | 3
with a single UPDATE.
So list_order is a field of the table where I have to save the order of rows. (I already have the solution, but have to wait for 2 days, so I'll publish then if nobody answers the question.)