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Code Issues Releases Wiki Activity

Add mention of FOR UPDATE and LIMIT/OFFSET>

This commit is contained in:
Bruce Momjian 1999-06-03 19:52:09 +00:00
parent e1ea7cc2e5
commit a4a5f56202
3 changed files with 27 additions and 4 deletions
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13
doc/src/sgml/ref/select.sgml
View File

@ -26,6 +26,8 @@ SELECT [ALL|DISTINCT [ON <replaceable class="PARAMETER">column</replaceable>] ]
[ HAVING <replaceable class="PARAMETER">condition</replaceable> [, ...] ]
[ { UNION [ALL] | INTERSECT | EXCEPT } <replaceable class="PARAMETER">select</replaceable> ]
[ ORDER BY <replaceable class="PARAMETER">column</replaceable> [ ASC | DESC ] [, ...] ]
[ FOR UPDATE [OF class_name...]]
[ LIMIT count [OFFSET|, count]]
</synopsis>
<refsect2 id="R2-SQL-SELECT-1">
@ -242,6 +244,15 @@ including duplicates.</para>
The EXCEPT give you the rows in the upper query not in the lower query.
(See EXCEPT clause).</para>
<para>
The FOR UPDATE clause allows the SELECT statement to perform
exclusive locking of selected rows.
(See EXCEPT clause).</para>
<para>
The LIMIT...OFFSET clause allows control over which rows are
returned by the query.</para>
<para>
You must have SELECT privilege to a table to read its values
(See <command>GRANT</command>/<command>REVOKE</command> statements).
@ -709,6 +720,8 @@ SELECT [ ALL | DISTINCT ] <replaceable class="PARAMETER">expression</replaceable
[ HAVING <replaceable class="PARAMETER">condition</replaceable> [, ...] ]
[ { UNION [ALL] | INTERSECT | EXCEPT } <replaceable class="PARAMETER">select</replaceable>]
[ ORDER BY <replaceable class="PARAMETER">column</replaceable> [ ASC | DESC ] [, ...] ]
[ FOR UPDATE [OF class_name...]]
[ LIMIT count [OFFSET|, count]]
</synopsis>
<refsect2 id="R2-SQL-SELECTINTO-1">

6
src/bin/psql/psqlHelp.h
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@ -5,7 +5,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: psqlHelp.h,v 1.67 1999/06/03 19:17:59 momjian Exp $
* $Id: psqlHelp.h,v 1.68 1999/06/03 19:52:08 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -317,8 +317,10 @@ TIMEZONE|XACTISOLEVEL|CLIENT_ENCODING|SERVER_ENCODING"},
\t[WHERE qual]\n\
\t[GROUP BY group_list]\n\
\t[HAVING having_clause]\n\
\t[ { UNION [ALL] | INTERSECT | EXCEPT } SELECT ...]\n\
\t[ORDER BY attr1 [ASC|DESC] [USING op1], ...attrN ]\n\
\t[ { UNION [ALL] | INTERSECT | EXCEPT } SELECT ...];"},
\t[FOR UPDATE [OF class_name...]]\n\
\t[LIMIT count [OFFSET|, count]];"},
{"set",
"set run-time environment",
"\

12
src/man/select.l
View File

@ -1,6 +1,6 @@
.\" This is -*-nroff-*-
.\" XXX standard disclaimer belongs here....
.\" $Header: /cvsroot/pgsql/src/man/Attic/select.l,v 1.12 1999/03/19 02:41:41 momjian Exp $
.\" $Header: /cvsroot/pgsql/src/man/Attic/select.l,v 1.13 1999/06/03 19:52:09 momjian Exp $
.TH SELECT SQL 11/05/95 PostgreSQL PostgreSQL
.SH NAME
select - retrieve instances from a class
@ -14,8 +14,10 @@ select - retrieve instances from a class
[\fBwhere\fR where-clause]
[\fBgroup by\fR attr_name1 {, attr_name-i....}]
[\fBhaving\fR having-clause]
[\fBorder by\fR attr_name1 [\fBasc\fR | \fBdesc\fR] [\fBusing op1\fR] {, attr_namei...}]
[ { \fBunion {all}\fR | \fBintersect\fR | \fBexcept\fR } \fBselect\fR ...]
[\fBorder by\fR attr_name1 [\fBasc\fR | \fBdesc\fR] [\fBusing op1\fR] {, attr_namei...}]
[\fBfor update\fR [\fBof\fR class_name...]]
[\fBlimit\fR count [\fBoffset\fR|, count]]
.fi
.SH DESCRIPTION
@ -37,6 +39,12 @@ clause allows a user to specify that he wishes the instances sorted
according to the corresponding operator. This operator must be a
binary one returning a boolean. Multiple sort fields are allowed and
are applied from left to right.
The
.BR "for update"
allows the select statement to perform exclusive locking of selected rows.
The
.BR "limit/offset"
allows control over which rows are returned by the query.
.PP
The target list specifies the fields to be retrieved. Each
.IR attr_name