MS SQL Query not updating

I think I need a fresh set of eyes here. I wrote a select statement just to make sure I was retrieving the correct records. I then converted it to an update statement. What I am trying to accomplish is to set the CategoryID based on the Category Name. After running the Update statement I would expect the Select statement to no longer return any records because now all the Category ID's are the same. However, it keeps returning the same records. What have I overlooked?
---- Select statement
select rbs.ItemNumber,rbs.CategoryID,nodx.CategoryID,rbs.CategoryName,nodc.Name,nodc.id
from rbsProductsByCategory rbs
inner join [NodusesSS]..[bvc_ProductXCategory] nodx on rbs.ItemNumber=nodx.ProductID
inner join [NodusesSS]..[bvc_Category] nodc on rbs.CategoryName= nodc.Name
where nodc.id<>rbs.CategoryID

---- Update Statement
update rbsProductsByCategory 
set CategoryID=nodc.id
from rbsProductsByCategory rbs
inner join [NodusesSS]..[bvc_ProductXCategory] nodx on rbs.ItemNumber=nodx.ProductID
inner join [NodusesSS]..[bvc_Category] nodc on rbs.CategoryName= nodc.Name
where nodc.id<>rbs.CategoryID

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rwheeler23Asked:
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LowfatspreadCommented:
could you show us some example data?

but my first thought is that you have a 1:m situation with 1 of the joins... so that potentially several candidates for each update exist...

what does this show

select rbs.ItemNumber,rbs.CategoryID,nodx.CategoryID,rbs.CategoryName,nodc.Name,count(distinct nodc.id) as uniq,count(*) as kount
from rbsProductsByCategory rbs
inner join [NodusesSS]..[bvc_ProductXCategory] nodx on rbs.ItemNumber=nodx.ProductID
inner join [NodusesSS]..[bvc_Category] nodc on rbs.CategoryName= nodc.Name
where nodc.id<>rbs.CategoryID
group by rbs.ItemNumber,rbs.CategoryID,nodx.CategoryID,rbs.CategoryName,nodc.Name

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rwheeler23Author Commented:
You were correct. I was working under the false impression that the CategoryName was unqiue. It was not. For about a dozen items there were two with the same categoryname so my update statment kept flipping the values.
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Microsoft SQL Server 2008

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