Date: Tue, 7 Aug 2018 18:54:26 -0400
From: Bruce Momjian <bruce@momjian.us>
To: sebastien.clement@canada.ca, pgsql-docs@lists.postgresql.org
Subject: Re: decimal digits precision for real and double precision types
Message-ID: <20180807225426.GA19156@momjian.us>
References: <153185494190.1395.13365433184520865716@wrigleys.postgresql.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <153185494190.1395.13365433184520865716@wrigleys.postgresql.org>
User-Agent: Mutt/1.5.23 (2014-03-12)
Precedence: bulk

On Tue, Jul 17, 2018 at 07:15:41PM +0000, PG Doc comments form wrote:
> The following documentation comment has been logged on the website:
> 
> Page: https://www.postgresql.org/docs/10/static/datatype-numeric.html
> Description:
> 
> In table 8.2 for numeric types, when the documentation states "6 decimal
> digits precision" for the real type, we are talking about 6 digits after the
> decimal point or 6 digits in total (before and after)?

Well the number is stored as a mantissa and exponent, so it is 6
mantissa digits plus an exponent from 1E-37 to 1E+37.

-- 
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

+ As you are, so once was I.  As I am, so you will be. +
+                      Ancient Roman grave inscription +