Help with one SQL query. (update player_storage where key xxxx set value 0)

[Stefan Brannfjell]

Hello everybody, well I am not good at scripting sql from scratch and I havent found any similar samples around, any help is highly appreciated! :)

Here is the situation:
My database have several storage values
Player ID - key - value
Sample:
(id) (key) (value)
20 - 1234 - 3

This means that player 20 have storageid 1234 with the value 3.

I believe this is a rather well used method for storing values, for scripts like.
If storageid 1234 = 3 then do something, else do nothing.

The problem:
I want to update the value of all lines that have key 1234 the value 0.

So the sample would be:
(id) (key) (value)
20 - 1234 - 0

I want the query to only update the value of key 1234. Not the other key values, and want it to affect all ids.

I thought of something like this:
update player_storage where key 1234 set value 0

But could anyone help me getting the correct sql value? I hope you understand my situation. :)