T-Sql Update mit Inner Join

UPDATE dbo.Table2   
SET dbo.Table2.ColB = dbo.Table2.ColB + dbo.Table1.ColB  
FROM dbo.Table2   
    INNER JOIN dbo.Table1   
    ON (dbo.Table1.ColA = 'PARAM')
WHERE dbo.Table2.ColB < dbo.Table1.ColB
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