From b9a990d8a88cc96b6555952e82629d7647f42e34 Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Mon, 20 Mar 2000 04:20:52 +0000
Subject: [PATCH] Add exp(), ln(), and some other functions to
numeric-functions table.
---
doc/src/sgml/func.sgml | 64 +++++++++++++++++++++++++++++++++++-------
1 file changed, 54 insertions(+), 10 deletions(-)
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 5c7529b7293..7fa24ec365b 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -41,20 +41,23 @@
<entry> COALESCE(<replaceable class="parameter">list</replaceable>) </entry>
<entry> non-NULL </entry>
<entry> return first non-NULL value in list </entry>
- <entry> COALESCE(<replaceable class="parameter">r"</replaceable>le>, <replaceable
- class="parameter">c2</replaceable> + 5, 0) </entry>
+ <entry> COALESCE(rle, c2 + 5, 0) </entry>
</row>
<row>
<entry> NULLIF(<replaceable class="parameter">input</replaceable>,<replaceable class="parameter">value</replaceable>) </entry>
<entry> <replaceable class="parameter">input</replaceable> or NULL </entry>
- <entry> return NULL if <replaceable class="parameter">input</replaceable> = <replaceable class="parameter">value</replaceable> </entry>
- <entry> NULLIF(<replaceable class="parameter">c1</replaceable>, 'N/A')</entry>
+ <entry> return NULL if
+ <replaceable class="parameter">input</replaceable> =
+ <replaceable class="parameter">value</replaceable>,
+ else <replaceable class="parameter">input</replaceable>
+ </entry>
+ <entry> NULLIF(c1, 'N/A') </entry>
</row>
<row>
<entry> CASE WHEN <replaceable class="parameter">expr</replaceable> THEN <replaceable class="parameter">expr</replaceable> [...] ELSE <replaceable class="parameter">expr</replaceable> END </entry>
<entry> <replaceable class="parameter">expr</replaceable> </entry>
- <entry> return expression for first true clause </entry>
- <entry> CASE WHEN <replaceable class="parameter">c1</replaceable> = 1 THEN 'match' ELSE 'no match' END </entry>
+ <entry> return expression for first true WHEN clause </entry>
+ <entry> CASE WHEN c1 = 1 THEN 'match' ELSE 'no match' END </entry>
</row>
</tbody>
</tgroup>
@@ -79,16 +82,52 @@
</thead>
<tbody>
<row>
- <entry> dexp(float8) </entry>
+ <entry> abs(float8) </entry>
+ <entry> float8 </entry>
+ <entry> absolute value </entry>
+ <entry> abs(-17.4) </entry>
+ </row>
+ <row>
+ <entry> sqrt(float8) </entry>
+ <entry> float8 </entry>
+ <entry> square root </entry>
+ <entry> sqrt(2.0) </entry>
+ </row>
+ <row>
+ <entry> exp(float8) </entry>
<entry> float8 </entry>
<entry> raise e to the specified exponent </entry>
- <entry> dexp(2.0) </entry>
+ <entry> exp(2.0) </entry>
</row>
<row>
- <entry> dpow(float8,float8) </entry>
+ <entry> ln(float8) </entry>
+ <entry> float8 </entry>
+ <entry> natural logarithm </entry>
+ <entry> ln(2.0) </entry>
+ </row>
+ <row>
+ <entry> log(float8) </entry>
+ <entry> float8 </entry>
+ <entry> base 10 logarithm </entry>
+ <entry> log(2.0) </entry>
+ </row>
+ <row>
+ <entry> pow(float8,float8) </entry>
<entry> float8 </entry>
<entry> raise a number to the specified exponent </entry>
- <entry> dpow(2.0, 16.0) </entry>
+ <entry> pow(2.0, 16.0) </entry>
+ </row>
+ <row>
+ <entry> round(float8) </entry>
+ <entry> float8 </entry>
+ <entry> round to nearest integer </entry>
+ <entry> round(42.4) </entry>
+ </row>
+ <row>
+ <entry> trunc(float8) </entry>
+ <entry> float8 </entry>
+ <entry> truncate (towards zero) </entry>
+ <entry> trunc(42.4) </entry>
</row>
<row>
<entry> float(int) </entry>
@@ -112,6 +151,11 @@
</tgroup>
</table>
</para>
+
+ <para>
+ Most of the functions listed for FLOAT8 are also available for
+ type NUMERIC.
+ </para>
</sect1>
<sect1>
--
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