diff options
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/func.sgml | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml index 82081e514fa..a5d81b6fddc 100644 --- a/doc/src/sgml/func.sgml +++ b/doc/src/sgml/func.sgml @@ -1,5 +1,5 @@ <!-- -$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.205 2004/05/26 18:35:31 momjian Exp $ +$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.206 2004/06/02 21:34:49 momjian Exp $ PostgreSQL documentation --> @@ -5971,6 +5971,22 @@ SELECT TIMESTAMP 'now'; as an array of two <type>point</> values. </para> + <para> + The <function>area</function> function works for the types + <type>box</type>, <type>circle</type>, and <type>path</type>. + The <function>area</function> function only works on the + <type>path</type> data type if the points in the + <type>path</type> are non-intersecting. For example, the + <type>path</type> + <literal>'((0,0),(0,1),(2,1),(2,2),(1,2),(1,0),(0,0))'::PATH</literal> + won't work, however, the following visually identical + <type>path</type> + <literal>'((0,0),(0,1),(1,1),(1,2),(2,2),(2,1),(1,1),(1,0),(0,0))'::PATH</literal> + will work. If the concept of an intersecting versus + non-intersecting <type>path</type> is confusing, draw both of the + above <type>path</type>s side by side on a piece of graph paper. + </para> + </sect1> |