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Marginal tweaks in the documentation for ORDER BY; in particular point

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out the common error that ORDER BY x, y DESC does not mean the same as
ORDER BY x DESC, y DESC.
This commit is contained in:
Tom Lane
2007-01-09 16:59:20 +00:00
parent 69db009163
commit 1e0bf9041e
2 changed files with 22 additions and 9 deletions
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9
doc/src/sgml/queries.sgml
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@@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/queries.sgml,v 1.40 2007/01/09 02:14:10 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/queries.sgml,v 1.41 2007/01/09 16:59:20 tgl Exp $ -->
<chapter id="queries">
<title>Queries</title>
@@ -1262,6 +1262,13 @@ SELECT a, b FROM table1 ORDER BY a + b, c;
<literal>DESC</> order, and <literal>NULLS LAST</> otherwise.
</para>
<para>
Note that the ordering options are considered independently for each
sort column. For example <literal>ORDER BY x, y DESC</> means
<literal>ORDER BY x ASC, y DESC</>, which is not the same as
<literal>ORDER BY x DESC, y DESC</>.
</para>
<para>
For backwards compatibility with the SQL92 version of the standard,
a <replaceable>sort_expression</> can instead be the name or number