Conditional SELECT - is it possible?

[Paul A]

I have a fully working query [snipped for brevity]:

SELECT
items.barcode AS Barcode,
items.year AS Year,
items.yeartwo AS YearTwo,
items.descrip AS Description
LEFT JOIN [etc, etc]
WHERE [etc, etc]

I only need 'YearTwo' IF 'Year' is null/blank, but cannot find the right syntax (along the lines of: "items.yeartwo AS Year WHERE items.year IS NULL" and am trying not to have to export the data into a perl routine. (all data is string, no date format.)

All/any assistance, suggestions would be greatly appreciated. Thanks - Paul.