Copy value across tables

I need to update rows of a table based on values in another. I've googled this all morning but cant find anything useful.

I have  Select statement where I can see all the records I need to update (below) but I cant seem to make an update query that updates only the records that are returned by the select statement.
Select tblA_CommonFeild, tblA_NeedsChanging, tblB_ReferenceFeild
From tblA, tblB
WHERE tblB_CommonFeild=tblA_CommonFeild AND tblB_ReferenceFeild = 'NewValue' AND tblA_NeedsChanging='OldValue'

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Jinesh KamdarCommented:
Try this.
UPDATE tblA INNER JOIN tblB ON tblA_CommonFeild = tblB_CommonFeild 
SET tblA.tblA_NeedsChanging = tblB.tblB_ReferenceFeild

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Jinesh KamdarCommented:
Or you can try this as well.

SET tblA_NeedsChanging = (SELECT tblB_ReferenceFeild FROM tblB WHERE tblB_CommonFeild = A.tblA_CommonFeild)
WHERE EXISTS (SELECT 1 FROM tblB WHERE tblB_CommonFeild = A.tblA_CommonFeild)

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iambagelsAuthor Commented:

i was trying to select from both tables
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