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Re: histogram

From: "David Johnston" <polobo(at)yahoo(dot)com>
To: "'Rob Sargent'" <robjsargent(at)gmail(dot)com>, "'Joel Reymont'" <joelr1(at)gmail(dot)com>
Cc: <pgsql-general(at)postgresql(dot)org>
Subject: Re: histogram
Date: 2011-04-30 21:41:52
Message-ID: 02a801cc077f$6bca68d0$435f3a70$@yahoo.com (view raw or flat)
Thread:
Lists: pgsql-general
Given that you are actively implementing the code that uses the 1 and 2 I
don't see how it is that egregious.  When generating calculated fields it is
cleaner than the alternative:

Select trunc(distance * 10.)/10., count(*)
>From doc_ads
Group by (trunc(distance * 10.))
Order by (trunc(distance * 10.))

It would be nice if you could do:

Select trunc(distance * 10.)/10. AS bin, count(*) AS frequency
>From doc_ads
Group by bin
Order by bin

But I do not believe that is allowed (though I may have my syntax wrong...)

David J.

>> re: 1 and 2. They're horrible (imho) reference to the attributes of the
returned tuple. Or at best an exposure of the implementation. :)

>>Joel Reymont wrote:
>>> I think this should do what I want
>>>
>>> 	select trunc(distance * 10.)/10., count(*)
>>> 	from doc_ads
>>> 	group by 1 order by 1
>>>
>>>   Thanks, Joel



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