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In 'Joins between classes' in Section 5 of the tutorial we have, in

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the first paragraph:

    As an example, say we wish to find all the records that
    are in the  temperature  range  of  other records. In
    effect, we need to compare the temp_lo and temp_hi
    attributes of each EMP instance to the temp_lo and
    temp_hi  attributes of all other EMP instances.

I believe that EMP should read WEATHER, as the example query that
follows joins WEATHER to itself.

EMP is often used in Oracle examples.

Regards,
Graham

Other RULE cleanups
This commit is contained in:
Bruce Momjian 2000-12-12 16:47:52 +00:00
parent 1045304a3b
commit 36da236eb3
2 changed files with 6 additions and 6 deletions
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6
doc/src/sgml/query.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/query.sgml,v 1.13 2000/09/29 20:21:34 petere Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/query.sgml,v 1.14 2000/12/12 16:47:52 momjian Exp $
-->
<chapter id="query">
@ -273,8 +273,8 @@ SELECT * INTO TABLE temp FROM weather;
As an example, say we wish to find all the records that
are in the temperature range of other records. In
effect, we need to compare the temp_lo and temp_hi
attributes of each EMP instance to the temp_lo and
temp_hi attributes of all other EMP instances.
attributes of each WEATHER instance to the temp_lo and
temp_hi attributes of all other WEATHER instances.
<note>
<para>
This is only a conceptual model. The actual join may

6
doc/src/sgml/ref/create_rule.sgml
View File

@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_rule.sgml,v 1.19 2000/10/05 19:48:17 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_rule.sgml,v 1.20 2000/12/12 16:47:52 momjian Exp $
Postgres documentation
-->
@ -208,14 +208,14 @@ ON UPDATE TO emp-1.salary WHERE emp-2.name = "Joe"
CREATE RULE bad_rule_combination_1 AS
ON SELECT TO emp
DO INSTEAD
SELECT TO toyemp;
SELECT * FROM toyemp;
</programlisting>
<programlisting>
CREATE RULE bad_rule_combination_2 AS
ON SELECT TO toyemp
DO INSTEAD
SELECT TO emp;
SELECT * FROM emp;
</programlisting>
<para>
This attempt to select from EMP will cause