| From: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
|---|---|
| To: | pgsql-general(at)postgresql(dot)org |
| Cc: | Ron Johnson <ron(dot)l(dot)johnson(at)cox(dot)net> |
| Subject: | Re: postgresql vs mysql |
| Date: | 2007-02-23 23:12:25 |
| Message-ID: | 200702240012.25734.peter_e@gmx.net |
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| Thread: | |
| Lists: | pgsql-general |
Ron Johnson wrote:
> Each of the daily/hourly/etc temperature readings are independent.
> Therefore they should each have their own row in the "meteorology
> readings" table. I *think* that breaks 3NF.
If everything is, as you say, independent, then there can be no 3NF
violation, because that only happens when you have functional
dependencies within a table.
The question that you raise is more a matter of deciding which aspects
of a problem are data and which are data structure.
--
Peter Eisentraut
http://developer.postgresql.org/~petere/
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