Question

I have a table called ticket in which I want to swap two rows when user click up/down button from front end.

For this I added a auto-generated field called ticket_index. But I am not able to perform this action.

I wrote the following query

   UPDATE ticket as ticket1 
   JOIN ticket as ticket2 ON (ticket1.ticket_index = 1 AND ticket2.ticket_index = 4) 
   OR (ticket1.ticket_index = 4 AND ticket2.ticket_index = 1) 
   SET 
       ticket1.ticket_index = ticket2.ticket_index,
       ticket2.ticket_index = ticket1.ticket_index

Can anyone give me the right SQL query? Please let me know if extra information is needed for this. Thanks

Answer 1

use a case statement, e.g.:

update ticket
set ticket_index = case when ticket_index = :x then :y else :x end
where ticket_index in (:x, :y);