From 291c875f239cd6a5238955eaef234d476103c8da Mon Sep 17 00:00:00 2001 From: Tom Lane Date: Sat, 13 Apr 2002 17:17:29 +0000 Subject: [PATCH] Update/correct inheritance examples. --- doc/src/sgml/inherit.sgml | 61 +++++++++++++++------------------------ 1 file changed, 24 insertions(+), 37 deletions(-) diff --git a/doc/src/sgml/inherit.sgml b/doc/src/sgml/inherit.sgml index cb4c8cb0af..a0d27b0768 100644 --- a/doc/src/sgml/inherit.sgml +++ b/doc/src/sgml/inherit.sgml @@ -1,5 +1,5 @@ @@ -56,35 +56,28 @@ SELECT name, altitude which returns: -+----------+----------+ -|name | altitude | -+----------+----------+ -|Las Vegas | 2174 | -+----------+----------+ -|Mariposa | 1953 | -+----------+----------+ -|Madison | 845 | -+----------+----------+ + name | altitude +-----------+---------- + Las Vegas | 2174 + Mariposa | 1953 + Madison | 845 On the other hand, the following query finds all the cities that are not state capitals and - are situated at an altitude of 500ft or higher: + are situated at an altitude over 500ft: SELECT name, altitude FROM ONLY cities WHERE altitude > 500; -+----------+----------+ -|name | altitude | -+----------+----------+ -|Las Vegas | 2174 | -+----------+----------+ -|Mariposa | 1953 | -+----------+----------+ + name | altitude +-----------+---------- + Las Vegas | 2174 + Mariposa | 1953 @@ -112,18 +105,16 @@ SELECT name, altitude which returns: -+---------+----------+----------+ -|tableoid |name | altitude | -+---------+----------+----------+ -|37292 |Las Vegas | 2174 | -+---------+----------+----------+ -|37280 |Mariposa | 1953 | -+---------+----------+----------+ -|37280 |Madison | 845 | -+---------+----------+----------+ + tableoid | name | altitude +----------+-----------+---------- + 139793 | Las Vegas | 2174 + 139793 | Mariposa | 1953 + 139798 | Madison | 845 - If you do a join with pg_class you can see the actual table name: + (If you try to reproduce this example, you will probably get different + numeric OIDs.) By doing a join with pg_class you can see the actual table + names: SELECT p.relname, c.name, c.altitude @@ -134,15 +125,11 @@ SELECT name, altitude which returns: -+---------+----------+----------+ -|relname |name | altitude | -+---------+----------+----------+ -|capitals |Las Vegas | 2174 | -+---------+----------+----------+ -|cities |Mariposa | 1953 | -+---------+----------+----------+ -|cities |Madison | 845 | -+---------+----------+----------+ + relname | name | altitude +----------+-----------+---------- + cities | Las Vegas | 2174 + cities | Mariposa | 1953 + capitals | Madison | 845