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Mr_Shaw

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isnull([columnname]) == TRUE ? "Unkown" : [columnname]

I am learning SSIS and I came across an expression simlar to the example bellow used in a 'Derived Column' transformation.

isnull([columnname]) ==  TRUE ? "Unkown" : [columnname]

I why is a question mark and colon used? What do they do in the express?
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vdr1620
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thanks