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| author | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2013-07-02 12:21:16 -0400 |
|---|---|---|
| committer | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2013-07-02 13:12:52 -0400 |
| commit | 148326b9940c6f3aa554df83a70c7d4563f67d86 (patch) | |
| tree | 24f534c5306731f27f7cad57d44e62fc3ea6af48 /doc/src | |
| parent | d2e71ff7573e67fc0a263d0ba6fe2ffbc175d1ad (diff) | |
| download | postgresql-148326b9940c6f3aa554df83a70c7d4563f67d86.tar.gz postgresql-148326b9940c6f3aa554df83a70c7d4563f67d86.zip | |
Mention extra_float_digits in floating point docs
Make it easier for readers of the FP docs to find out about possibly
truncated values.
Per complaint from Tom Duffey in message
F0E0F874-C86F-48D1-AA2A-0C5365BF5118@trillitech.com
Author: Albe Laurenz
Reviewed by: Abhijit Menon-Sen
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/config.sgml | 1 | ||||
| -rw-r--r-- | doc/src/sgml/datatype.sgml | 11 |
2 files changed, 12 insertions, 0 deletions
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml index 940ed6ef58b..437dbb7711c 100644 --- a/doc/src/sgml/config.sgml +++ b/doc/src/sgml/config.sgml @@ -5366,6 +5366,7 @@ SET XML OPTION { DOCUMENT | CONTENT }; partially-significant digits; this is especially useful for dumping float data that needs to be restored exactly. Or it can be set negative to suppress unwanted digits. + See also <xref linkend="datatype-float">. </para> </listitem> </varlistentry> diff --git a/doc/src/sgml/datatype.sgml b/doc/src/sgml/datatype.sgml index f73e6b2e3a5..87668ea0c1c 100644 --- a/doc/src/sgml/datatype.sgml +++ b/doc/src/sgml/datatype.sgml @@ -681,6 +681,17 @@ NUMERIC from zero will cause an underflow error. </para> + <note> + <para> + The <xref linkend="guc-extra-float-digits"> setting controls the + number of extra significant digits included when a floating point + value is converted to text for output. With the default value of + <literal>0</literal>, the output is the same on every platform + supported by PostgreSQL. Increasing it will produce output that + more accurately represents the stored value, but may be unportable. + </para> + </note> + <indexterm> <primary>not a number</primary> <secondary>double precision</secondary> |