Update array slice documentation to be clearer.

bmomjian · bmomjian · commit 1b52359d90d4 · 2007-02-20T14:34:25.000Z
diff --git a/doc/src/sgml/array.sgml b/doc/src/sgml/array.sgml
@@ -1,4 +1,4 @@
-<!-- $PostgreSQL: pgsql/doc/src/sgml/array.sgml,v 1.56 2007/02/01 00:28:16 momjian Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/array.sgml,v 1.57 2007/02/20 14:34:25 momjian Exp $ -->
 
 <sect1 id="arrays">
  <title>Arrays</title>
@@ -243,18 +243,14 @@ SELECT schedule[1:2][1:1] FROM sal_emp WHERE name = 'Bill';
 (1 row)
 </programlisting>
 
-  We could also have written:
+  If any dimmension is written as a slice, i.e contains a colon, then all
+  dimmensions are treated as slices.  If a dimmension is missing, it is
+  assumed to be <literal>[1:1]</>.  If a dimmension has only a single
+  number (no colon), that dimmension is treated as being from <literal>1</>
+  to the number specified.  For example, <literal>[2]</> is treated as
+  <literal>[1:2], as in this example:
 
 <programlisting>
-SELECT schedule[1:2][1] FROM sal_emp WHERE name = 'Bill';
-</programlisting>
-
-  with the same result.  An array subscripting operation is always taken to
-  represent an array slice if any of the subscripts are written in the form
-  <literal><replaceable>lower</replaceable>:<replaceable>upper</replaceable></literal>.
-  A lower bound of 1 is assumed for any subscript where only one value
-  is specified, as in this example:
-<programlisting>
 SELECT schedule[1:2][2] FROM sal_emp WHERE name = 'Bill';
 
                  schedule
