Add contents of one table's column to another table

Sorry, I'm a real newbie to SQL. I have two tables with the same columns and would like to do the following:

Add the contents of Table2.ColumnX to Table1.ColumnX where Table1.pkID = Table2.pkID (all the rows are the same in both tables except for the values of ColumnX)

Thanks in advance for any help!
siono3Asked:
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mbizupCommented:
Try this:

SELECT Table2.ColumnX + Table1.ColumnX  as YourSum
FROM  Table1 Inner Join Table2 ON Table1.pkID = Table2.pkID
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mbizupCommented:
If you actually need to update Table1's data, not just a select query, make a backup and try this:

Update Table1 Inner Join Table2 ON Table1.pkID = Table2.pkID
SET  Table2.ColumnX  = Table2.ColumnX + Table1.ColumnX  
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mbizupCommented:
Correction... The update query I posted before will update table2's data.  This will update table1:

Update Table1 Inner Join Table2 ON Table1.pkID = Table2.pkID
SET  Table1.ColumnX  = Table2.ColumnX + Table1.ColumnX  
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siono3Author Commented:
Thanks mbizup,

That almost worked. For some reason I had to tweak it a little bit and ended up with the following:
UPDATE    Table1
SET              Table1.ColumnX = Table2.ColumnX
FROM         Table1 INNER JOIN
                      Table2 ON Table1.pkID = Table2.pkID

but you set me on the right track...
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