Index: plsql.sgml
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RCS file: /home/projects/pgsql/cvsroot/pgsql/doc/src/sgml/plsql.sgml,v
retrieving revision 2.32
diff -w -b -i -B -c -r2.32 plsql.sgml
*** plsql.sgml	2001/05/17 21:50:16	2.32
--- plsql.sgml	2001/05/22 12:38:49
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*** 880,891 ****
      <title>Conditional Control: IF statements</title>
  
      <para>
!      <function>IF</function> statements let you take action
!      according to certain conditions. PL/pgSQL has three forms of
!      IF: IF-THEN, IF-THEN-ELSE, IF-THEN-ELSE IF. NOTE: All
!      PL/pgSQL IF statements need a corresponding <function>END
!      IF</function> statement. In ELSE-IF statements you need two:
!      one for the first IF and one for the second (ELSE IF).
      </para>
  
      <variablelist>
--- 880,890 ----
      <title>Conditional Control: IF statements</title>
  
      <para>
!      <function>IF</function> statements let you take action according to
!       certain conditions. PL/pgSQL has four forms of IF: IF-THEN, IF-THEN-ELSE,
!       IF-THEN-ELSE IF, IF-THEN-ELSIF-THEN-ELSE. NOTE: All PL/pgSQL IF statements need
!       a corresponding <function>END IF</function> statement. In ELSE-IF statements
!       you need two: one for the first IF and one for the second (ELSE IF).
      </para>
  
      <variablelist>
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*** 979,984 ****
--- 978,1018 ----
         </para>
        </listitem>
       </varlistentry>
+ 
+      <varlistentry>
+       <term>
+        IF-THEN-ELSIF-ELSE
+       </term>
+ 
+       <listitem>
+        <para>
+         IF-THEN-ELSIF-ELSE allows you, to add multiple decisions
+         in one statement. Internally it is handled as nested 
+         IF-THEN-ELSE-IF-THEN commands. The (optionally) ELSE
+         branch is called, when none of all conditions is met.
+        </para>
+ 
+        <para>
+         Here is an example:
+        </para>
+ 
+ <programlisting>
+ IF number = 0 THEN
+     result := ''zero'';
+ ELSIF number &lt; 0 THEN
+     result := ''negative'';
+ ELSIF number &gt; 0 THEN 
+     result := ''negative'';
+ ELSE
+     -- now it seems to be NULL
+     result := ''NULL'';
+ END IF;
+ </programlisting>
+        </para>
+       </listitem>
+      </varlistentry>
+ 
+ 
      </variablelist>
     </sect3>