I didn't formulate my question properly, because the query went like
 "select alldefects /wordcount" 
where alldefects and wordcount are integers.   But none of the different ways 
of putting the double colon seemed to work. 

The Postgres notation of this simple procedure is very unintuitive. I haven't 
been able to remember several times, and most people think of me as a person 
with a reasonably good memory. There is no obvious place in the documentation 
to look this up.


On 12/4/18, 2:45 PM, "David G. Johnston" <david.g.johns...@gmail.com> wrote:

    On Tue, Dec 4, 2018 at 1:38 PM Joshua D. Drake <j...@commandprompt.com> 
wrote:
    > I may be misunderstanding the question but:
    Indeed...
    > select cast(x/y as numeric(10,4));
    
    Your answer is 2.0 instead of the correct 2.5 - you need to cast
    before the division, not after.
    
    David J.
    

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