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Add exp(), ln(), and some other functions to numeric-functions table.

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This commit is contained in:
Tom Lane 2000-03-20 04:20:52 +00:00
parent 339fe3c4cb
commit b9a990d8a8
1 changed files with 55 additions and 11 deletions
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66
doc/src/sgml/func.sgml
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@ -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> raise e to the specified exponent </entry>
<entry> dexp(2.0) </entry>
<entry> absolute value </entry>
<entry> abs(-17.4) </entry>
</row>
<row>
<entry> dpow(float8,float8) </entry>
<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> exp(2.0) </entry>
</row>
<row>
<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>