Question

These two links are related to this question I guess, but I do not find a way out to solve my requirement which is slightly different.

I have a table, say like this:

fruit         color
--------------------
mango          red
apple          red
orange         yellow
banana         green

I need to UPDATE field color in such a way that red becomes yellow and yellow becomes red. Here is how the table should look like after update query.

fruit         color
--------------------
mango          yellow
apple          yellow
orange         red
banana         green

This query wont work obviously.

UPDATE plant SET color = 'yellow' WHERE color = 'red';
UPDATE plant SET color = 'red' WHERE color = 'yellow'

Thanks.

Answer 1

You can do it in a single query:

UPDATE plant 
SET    color = IF(color = 'yellow', 'red', IF(color = 'red', 'yellow', color))
WHERE  color IN ('red', 'yellow');