Updating display order of multiple MySQL rows in one or very few queries

Question

I have a table with say 20 rows each with a number for display order (1-20).

SELECT * FROM `mytable` ORDER BY `display_order` DESC;

From an adm

Answer 1

A little late, but it may be useful to someone else:

UPDATE mytable SET display_order = FIND_IN_SET(rowId, '1,9,2,6,23') WHERE rowId in (1,9,2,6,23)