<type>text[]</type>, <type>text[]</type> )
        <returnvalue>hstore</returnvalue>
       </para>
       <para>
        Constructs an <type>hstore</type> from separate key and value arrays.
       </para>
       <para>
        <literal>hstore(ARRAY['a','b'], ARRAY['1','2'])</literal>
        <returnvalue>"a"=&gt;"1", "b"=&gt;"2"</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>hstore</function> ( <type>text</type>, <type>text</type> )
        <returnvalue>hstore</returnvalue>
       </para>
       <para>
        Makes a single-item <type>hstore</type>.
       </para>
       <para>
        <literal>hstore('a', 'b')</literal>
        <returnvalue>"a"=&gt;"b"</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm><primary>akeys</primary></indexterm>
        <function>akeys</function> ( <type>hstore</type> )
        <returnvalue>text[]</returnvalue>
       </para>
       <para>
        Extracts an <type>hstore</type>'s keys as an array.
       </para>
       <para>
        <literal>akeys('a=&gt;1,b=&gt;2')</literal>
        <returnvalue>{a,b}</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm><primary>skeys</primary></indexterm>
        <function>skeys</function> ( <type>hstore</type> )
        <returnvalue>setof text</returnvalue>
       </para>
       <para>
        Extracts an <type>hstore</type>'s keys as a set.
       </para>
       <para>
        <literal>skeys('a=&gt;1,b=&gt;2')</literal>
        <returnvalue></returnvalue>
<programlisting>
a
b
</programlisting>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm><primary>avals</primary></indexterm>
        <function>avals</function> ( <type>hstore</type> )
        <returnvalue>text[]</returnvalue>
       </para>
       <para>
        Extracts an <type>hstore</type>'s values as an array.
       </para>
       <para>
        <literal>avals('a=&gt;1,b=&gt;2')</literal>
        <returnvalue>{1,2}</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm><primary>svals</primary></indexterm>
        <function>svals</function> ( <type>hstore</type> )
        <returnvalue>setof text</returnvalue>
       </para>
       <para>
        Extracts an <type>hstore</type>'s values as a set.
       </para>
       <para>
        <literal>svals('a=&gt;1,b=&gt;2')</literal>
        <returnvalue></returnvalue>
<programlisting>
1
2
</programlisting>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm><primary>hstore_to_array</primary></indexterm>
        <function>hstore_to_array</function> ( <type>hstore</type> )
        <returnvalue>text[]</returnvalue>
       </para>
       <para>
        Extracts an <type>hstore</type>'s keys and values as an array of
        alternating keys and values.
       </para>
       <para>
        <literal>hstore_to_array('a=&gt;1,b=&gt;2')</literal>
        <returnvalue>{a,1,b,2}</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm><primary>hstore_to_matrix</primary></indexterm>
        <function>hstore_to_matrix</function> ( <type>hstore</type> )
        <returnvalue>text[]</returnvalue>
       </para>
       <para>
        Extracts an <type>hstore</type>'s keys and values as a two-dimensional
        array.
       </para>
       <para>
        <literal>hstore_to_matrix('a=&gt;1,b=&gt;2')</literal>
        <returnvalue>{{a,1},{b,2}}</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para