Fix (mis)information about NULLIF() SQL function.

Thanks to Tom Lane for pointing it out.

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 492859f56b6243af532fb328aa9b85403f53cbfa..2bfec9272e5aa8411d69e67d89df92549afb24ff 100644 (file)
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -45,10 +45,10 @@
          class="parameter">c2</replaceable> + 5, 0) </entry>
        </row>
        <row>
-       <entry> IFNULL(<replaceable class="parameter">input</replaceable>,<replaceable class="parameter">non-NULL substitute</replaceable>) </entry>
-       <entry> non-NULL </entry>
-       <entry> return second argument if first is NULL </entry>
-       <entry> IFNULL(<replaceable class="parameter">c1</replaceable>, 'N/A')</entry>
+       <entry> NULLIF(<replaceable class="parameter">input</replaceable>,<replaceable class="parameter">value</replaceable>) </entry>
+       <entry> <replaceable class="parameter">input</replaceable> or NULL </entry>
+       <entry> return NULL if <replaceable class="parameter">input</replaceable> = <replaceable class="parameter">value</replaceable> </entry>
+       <entry> NULLIF(<replaceable class="parameter">c1</replaceable>, 'N/A')</entry>
        </row>
        <row>
        <entry> CASE WHEN <replaceable class="parameter">expr</replaceable> THEN <replaceable class="parameter">expr</replaceable> [...] ELSE <replaceable class="parameter">expr</replaceable> END </entry>