Richard Klingler <rich...@klingler.net> wrote:

> Good day...
> 
> I'm trying to build a query for PGSQL 9.1 where a table has two 
> references with only one being used depending of the type of entry..
> 
> For example, the table has following simplified structure:
> 
>       portid          primary key
>       port2node       index to table node
>       port2card       index to table card
> 
> So how can I do a conditional FROM clause in the query depending on the 
> column port2node and port2card?
> If port2card is Null or 0 I don't want it in the FROM clause as the 
> query will return unneccessary duplicate
> row...the same goes for port2node being Null or 0...

I think, you can't do that, you have to build your query and execute
that string. You should use a function to do that.



Andreas
-- 
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unintentional side effect.                              (Linus Torvalds)
"If I was god, I would recompile penguin with --enable-fly."   (unknown)
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