I might do the substitution, analyse the query and hope to break it up.
Can it possibly be optimal?
Little, Douglas wrote:
> Hi Rob,
> Thanks for the response.
> Repeating the base calculation will work but the calculations are stunningly complex and long. Repeating them will
undoubtlyincrease editing errors and maintenance problems.
>
> Wish I had a sample to post. Last query I analyzed was approx 10k lines and printed to over 50 pages. Yes, it was
asingle query. I'm amazed that cognos would generate. Basically they generate a pivoted cross-tab from sql.
>
> Thanks
> Doug
>
>
>
>
> -----Original Message-----
> From: Rob Sargent [mailto:robjsargent@gmail.com]
> Sent: Wednesday, September 09, 2009 11:59 PM
> To: Little, Douglas
> Subject: Re: [SQL] how to: refer to select list calculations other places in the calculations.
>
> Would reverting to the base columns work?
>
> select a, b, a+b as c, (a+b)*d, (a+b)*f etc.
>
> Little, Douglas wrote:
>
>> Hi,
>>
>> I have very complex sql (generated by cognos) I'm porting from
>> Teradata that basically uses column alias in the calculated columns.
>>
>> Is there any way to do this type of thing in Psql?
>>
>> Essentially I need to do is refer to a calculated column later in the
>> select list (but far more complex - like 50 pages printed out)
>>
>> sel a,b,a+b as c, c*d, c*f, c*g, c*h, c*I, c*j, c*k,...... --- where c is
>> a calculated column used in other calculations.
>>
>> from ....
>>
>> **Doug Little**
>>
>> Sr. Data Warehouse Architect | Enterprise Data Management | Orbitz
>> Worldwide
>>
>> 500 W. Madison, Suite 1000 Chicago IL 60661| Office 312.260.2588 | Fax
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>>
>>
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>>
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