[help] Merging guest posts

[Meatshield]

I am trying to merge guest posts to a current member
I have tried this quiry:
update post
set userid="2"
where (username = "bobx" and userid = "0");

The quiry itself worked as the out come was:
Affected rows: 0 (Query took 0.0005 sec)
but as you see nothing was effected

Is there any other way round this?

[Marco van Herwaarden]

try:
update post
set userid=2
where username = 'bobx' and userid = 0

[Meatshield]

I fixed it I looked in the post table and found I was using the wrong second user id ('bobx' and userid = 0)it should have been 272 not 0, thank you for your help though.