How can I append a string to an existing field in MySQL?

I want to update the code on all my record to what they currently are plus _standard any ideas?

So for example if the codes are apple_1 and apple_2 I need them to be apple_1_standard and apple_2_standard

Before:


id code
------------
1 apple_1
1 apple_2

Psuedo Query:


update categories set code = code + "_standard" where id = 1;

Expected result:


id code
----------------------
1 apple_1_standard
1 apple_2_standard

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