| From: | "Chris Travers" <chris(at)travelamericas(dot)com> |
|---|---|
| To: | "Yasir Malik" <ymalik(at)heineken(dot)cs(dot)stevens-tech(dot)edu>, "PostgreSQL" <pgsql-sql(at)postgresql(dot)org> |
| Subject: | Re: Anti log in PostgreSQL |
| Date: | 2003-12-27 02:14:40 |
| Message-ID: | 000801c3cc61$1cdc75d0$93285e3d@winxp |
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| Thread: | |
| Lists: | pgsql-admin pgsql-sql |
Definition of log (base n) is that log n(x) = y where n^y = x for all values
of x and y. n is the base.
So a base 10 log would be reversed by doing 10^x=y. If we know x, we use
the exponential operation; if we know y we use log(y) = x. For ln (natural
logs, base e, e is approx. 2.818), use e^x=y.
Hope this explains things.
Best Wishes,
Chris Travers
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