On 2010-12-08, Andre Lopes <lopes80an...@gmail.com> wrote:
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> Hi,
>
> I need to obtain the maximum value of a date, but that comparison will be
> made between 3 tables... I will explain better with a query...

you probably want
  greatest(d1,d2,d3)
or possibly
  max(greatest(d1,d2,d3))


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