git.postgresql.org Git - postgresql.git/commitdiff

diff --git a/doc/src/sgml/queries.sgml b/doc/src/sgml/queries.sgml

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--- a/doc/src/sgml/queries.sgml

+++ b/doc/src/sgml/queries.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/queries.sgml,v 1.40 2007年01月09日 02:14:10 tgl Exp $ -->

+<!-- $PostgreSQL: pgsql/doc/src/sgml/queries.sgml,v 1.41 2007年01月09日 16:59:20 tgl Exp $ -->

<chapter id="queries">

<title>Queries</title>

<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

diff --git a/doc/src/sgml/ref/select.sgml b/doc/src/sgml/ref/select.sgml

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--- a/doc/src/sgml/ref/select.sgml

+++ b/doc/src/sgml/ref/select.sgml

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-$PostgreSQL: pgsql/doc/src/sgml/ref/select.sgml,v 1.95 2007年01月09日 02:14:10 tgl Exp $

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PostgreSQL documentation

-->

<synopsis>

ORDER BY <replaceable class="parameter">expression</replaceable> [ ASC | DESC | USING <replaceable class="parameter">operator</replaceable> ] [ NULLS { FIRST | LAST } ] [, ...]

</synopsis>

- <replaceable class="parameter">expression</replaceable> can be the

- name or ordinal number of an output column

- (<command>SELECT</command> list item), or it can be an arbitrary

- expression formed from input-column values.

- </para>

-

- <para>

The <literal>ORDER BY</literal> clause causes the result rows to

be sorted according to the specified expression(s). If two rows are

equal according to the leftmost expression, they are compared

an implementation-dependent order.

</para>

+ <para>

+ Each <replaceable class="parameter">expression</replaceable> can be the

+ name or ordinal number of an output column

+ (<command>SELECT</command> list item), or it can be an arbitrary

+ expression formed from input-column values.

+ </para>

+

<para>

The ordinal number refers to the ordinal (left-to-right) position

of the result column. This feature makes it possible to define an

on whether the operator is a less-than or greater-than operator.

</para>

+ <para>

+ Note that ordering options apply only to the expression they follow;

+ for example <literal>ORDER BY x, y DESC</> does not mean

+ the same thing as <literal>ORDER BY x DESC, y DESC</>.

+ </para>

+

<para>

Character-string data is sorted according to the locale-specific

collation order that was established when the database cluster