Why do the following two queries fail to find the printer makers?

Posted by ovr on Stack Overflow See other posts from Stack Overflow or by ovr
Published on 2010-06-08T19:19:19Z Indexed on 2010/06/08 19:22 UTC
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select distinct maker from product
where model in (select model from printer)

select distinct maker from product, printer
where product.model = printer.model

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