Doc: fix bogus example.

This wasn't incorrect SQL, but it was doing cm-to-inch conversion
backward, so it might confuse readers.

Per bug #15849 from TAKATSUKA Haruka.

Discussion: https://postgr.es/m/15849-37ad0c561a836107@postgresql.org

diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml
index b80040d0cc265799bf772ffda4b1a8a80bbd168f..ed2d9c60d50f62bf88c1ce7d8904361ee0bd42b6 100644 (file)
--- a/doc/src/sgml/ddl.sgml
+++ b/doc/src/sgml/ddl.sgml
@@ -259,7 +259,7 @@ CREATE TABLE products (
 CREATE TABLE people (
     ...,
     height_cm numeric,
-    height_in numeric <emphasis>GENERATED ALWAYS AS (height_cm * 2.54) STORED</emphasis>
+    height_in numeric <emphasis>GENERATED ALWAYS AS (height_cm / 2.54) STORED</emphasis>
 );
 </programlisting>
    The keyword <literal>STORED</literal> must be specified to choose the