role="func_table_entry"><para role="func_signature">
        Function
       </para>
       <para>
        Description
       </para>
       <para>
        Example(s)
       </para></entry>
      </row>
     </thead>

     <tbody>
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm>
         <primary>sinh</primary>
        </indexterm>
        <function>sinh</function> ( <type>double precision</type> )
        <returnvalue>double precision</returnvalue>
       </para>
       <para>
        Hyperbolic sine
       </para>
       <para>
        <literal>sinh(1)</literal>
        <returnvalue>1.1752011936438014</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm>
         <primary>cosh</primary>
        </indexterm>
        <function>cosh</function> ( <type>double precision</type> )
        <returnvalue>double precision</returnvalue>
       </para>
       <para>
        Hyperbolic cosine
       </para>
       <para>
        <literal>cosh(0)</literal>
        <returnvalue>1</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm>
         <primary>tanh</primary>
        </indexterm>
        <function>tanh</function> ( <type>double precision</type> )
        <returnvalue>double precision</returnvalue>
       </para>
       <para>
        Hyperbolic tangent
       </para>
       <para>
        <literal>tanh(1)</literal>
        <returnvalue>0.7615941559557649</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm>
         <primary>asinh</primary>
        </indexterm>
        <function>asinh</function> ( <type>double precision</type> )
        <returnvalue>double precision</returnvalue>
       </para>
       <para>
        Inverse hyperbolic sine
       </para>
       <para>
        <literal>asinh(1)</literal>
        <returnvalue>0.881373587019543</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm>
         <primary>acosh</primary>
        </indexterm>
        <function>acosh</function> ( <type>double precision</type> )
        <returnvalue>double precision</returnvalue>
       </para>
       <para>
        Inverse hyperbolic cosine
       </para>
       <para>
        <literal>acosh(1)</literal>
        <returnvalue>0</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm>
         <primary>atanh</primary>
        </indexterm>
        <function>atanh</function> ( <type>double precision</type> )
        <returnvalue>double precision</returnvalue>
       </para>
       <para>
        Inverse hyperbolic tangent
       </para>
       <para>
        <literal>atanh(0.5)</literal>
        <returnvalue>0.5493061443340548</returnvalue>
       </para></entry>
      </row>
     </tbody>
    </tgroup>
   </table>

  </sect1>


  <sect1 id="functions-string">
   <title>String Functions and Operators</title>

   <para>
    This section describes functions and operators for examining and
    manipulating string values.  Strings in this context include values
    of the types <type>character</type>, <type>character varying</type>,
    and <type>text</type>.  Except where noted, these functions and operators
    are declared to accept and return type <type>text</type>.  They will
    interchangeably accept <type>character varying</type> arguments.
    Values of type <type>character</type> will be converted
    to <type>text</type> before the function or operator is applied, resulting
    in stripping any trailing spaces in the <type>character</type> value.
   </para>

   <para>
    <acronym>SQL</acronym> defines some string functions that