Re: a very primitive question about division
| От | Martin Mueller |
|---|---|
| Тема | Re: a very primitive question about division |
| Дата | |
| Msg-id | FA35AEB5-7FCD-4002-8164-C3E421BFB7E2@northwestern.edu обсуждение исходный текст |
| Ответ на | Re: a very primitive question about division ("David G. Johnston" <david.g.johnston@gmail.com>) |
| Ответы |
Re: a very primitive question about division
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| Список | pgsql-general |
In Table 9.5 the division of 9 by 4 is indeed described clearly. But there is no example of 4/9 and the different ways of formatting it as a decimal fraction with different options for rounding or a percentage. Two or three added examples would make life easier for folks who have not progressed much beyond 8th grade math.
From: "David G. Johnston" <david.g.johnston@gmail.com>
Date: Wednesday, March 7, 2018 at 11:43 AM
To: Martin Mueller <martinmueller@northwestern.edu>
Cc: "pgsql-general@lists.postgresql.org" <pgsql-general@lists.postgresql.org>
Subject: Re: a very primitive question about division
Thanks. So round(before1550/colfreq::numeric, 2) produces the desired result.
The explanations and examples of string functions in the Postgres documentation are a model of clarity. The explanations and examples of basic arithmetic operations are not. There is room for improvement there.
Possibly. Patches (or even just email suggestions - though the former are generally more apt to get applied) detailing specific improvements to make are welcome.
The description "division (integer division truncates the result)" seems reasonably clear - if you don't want the result truncated, and have two integers, you have to make one of the inputs a non-integer. Of the various options I tend to choose numeric though others are possible.
David J.
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