precision</returnvalue>
       </para>
       <para>
        Natural logarithm
       </para>
       <para>
        <literal>ln(2.0)</literal>
        <returnvalue>0.6931471805599453</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm>
         <primary>log</primary>
        </indexterm>
        <function>log</function> ( <type>numeric</type> )
        <returnvalue>numeric</returnvalue>
       </para>
       <para role="func_signature">
        <function>log</function> ( <type>double precision</type> )
        <returnvalue>double precision</returnvalue>
       </para>
       <para>
        Base 10 logarithm
       </para>
       <para>
        <literal>log(100)</literal>
        <returnvalue>2</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm>
         <primary>log10</primary>
        </indexterm>
        <function>log10</function> ( <type>numeric</type> )
        <returnvalue>numeric</returnvalue>
       </para>
       <para role="func_signature">
        <function>log10</function> ( <type>double precision</type> )
        <returnvalue>double precision</returnvalue>
       </para>
       <para>
        Base 10 logarithm (same as <function>log</function>)
       </para>
       <para>
        <literal>log10(1000)</literal>
        <returnvalue>3</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>log</function> ( <parameter>b</parameter> <type>numeric</type>,
        <parameter>x</parameter> <type>numeric</type> )
        <returnvalue>numeric</returnvalue>
       </para>
       <para>
        Logarithm of <parameter>x</parameter> to base <parameter>b</parameter>
       </para>
       <para>
       <literal>log(2.0, 64.0)</literal>
       <returnvalue>6.0000000000000000</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm>
         <primary>min_scale</primary>
        </indexterm>
        <function>min_scale</function> ( <type>numeric</type> )
        <returnvalue>integer</returnvalue>
       </para>
       <para>
        Minimum scale (number of fractional decimal digits) needed
        to represent the supplied value precisely
       </para>
       <para>
        <literal>min_scale(8.4100)</literal>
        <returnvalue>2</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm>
         <primary>mod</primary>
        </indexterm>
        <function>mod</function> ( <parameter>y</parameter> <replaceable>numeric_type</replaceable>,
        <parameter>x</parameter> <replaceable>numeric_type</replaceable> )
        <returnvalue><replaceable>numeric_type</replaceable></returnvalue>
       </para>
       <para>
        Remainder of <parameter>y</parameter>/<parameter>x</parameter>;
        available for <type>smallint</type>, <type>integer</type>,
        <type>bigint</type>, and <type>numeric</type>
       </para>
       <para>
        <literal>mod(9, 4)</literal>
        <returnvalue>1</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm>
         <primary>pi</primary>
        </indexterm>
        <function>pi</function> (  )
        <returnvalue>double precision</returnvalue>
       </para>
       <para>
        Approximate value of <phrase role="symbol_font">&pi;</phrase>
       </para>
       <para>
        <literal>pi()</literal>
        <returnvalue>3.141592653589793</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm>
         <primary>power</primary>
        </indexterm>