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<reference xml:id="ref.pgsql" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <title>PostgreSQL &Functions;</title>

 <partintro>
  <section xml:id="pgsql.notes">
  &reftitle.notes;
   <note>
    <para>
     Not all functions are supported by all builds. It depends on your
     libpq (The PostgreSQL C client library) version and how libpq is
     compiled. If PHP PostgreSQL extensions are missing, then it is because
     your libpq version does not support them. 
    </para>
   </note>  
   <note>
    <para>
     Most PostgreSQL functions accept <parameter>connection</parameter> as
     the first optional parameter. If it is not provided, the last opened
     connection is used. If it doesn't exist, functions return &false;.
    </para>
   </note>
   <note>
    <para>
     PostgreSQL automatically folds all identifiers (e.g. table/column names)
     to lower-case values at object creation time and at query time. 
     To force the use of mixed or upper case identifiers, you must escape
     the identifier using double quotes ("").
    </para>
   </note>
   <note>
    <para>
     PostgreSQL does not have special commands for fetching database schema
     information (eg. all the tables in the current database).  Instead, there
     is a standard schema named <literal>information_schema</literal> in
     PostgreSQL 7.4 and above containing
     system views with all the necessary information, in an easily
     queryable form.  See the <link xlink:href="&url.pgsql.manual;">PostgreSQL Documentation</link>
     for full details.  
    </para>
   </note>
  </section>
 </partintro>

&reference.pgsql.entities.functions;

</reference>

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