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Complete merge of all old man page information.

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ecpg reference page still needs formatting.
This commit is contained in:
Thomas G. Lockhart
1999-07-22 15:09:15 +00:00
parent 2aa64f79f5
commit a27512e634
81 changed files with 2292 additions and 772 deletions
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41
doc/src/sgml/ref/alter_table.sgml
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@@ -1,6 +1,11 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/alter_table.sgml,v 1.8 1999/07/22 15:09:06 thomas Exp $
Postgres documentation
-->
<refentry id="SQL-ALTERTABLE">
<refmeta>
<refentrytitle>
<refentrytitle id="sql-altertable-title">
ALTER TABLE
</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
@@ -15,7 +20,7 @@
</refnamediv>
<refsynopsisdiv>
<refsynopsisdivinfo>
<date>1998-04-15</date>
<date>1999-07-20</date>
</refsynopsisdivinfo>
<synopsis>
ALTER TABLE <replaceable class="PARAMETER">table</replaceable>
@@ -166,9 +171,37 @@ ERROR
</para>
<para>
<quote>[*]</quote> following a name of a table indicates that statement
<quote>*</quote> following a name of a table indicates that the statement
should be run over that table and all tables below it in the
inheritance hierarchy.
inheritance hierarchy;
by default, the attribute will not be added to or renamed in any of the subclasses.
This should always be done when adding or modifying an attribute in a
superclass. If it is not, queries on the inheritance hierarchy
such as
<programlisting>
SELECT <replaceable>NewColumn</replaceable> FROM <replaceable>SuperClass</replaceable>*
</programlisting>
will not work because the subclasses will be missing an attribute
found in the superclass.
</para>
<para>
For efficiency reasons, default values for added attributes are
not placed in existing instances of a class.
That is, existing instances will have NULL values in the new
attributes. If non-NULL values are desired, a subsequent
<command>UPDATE</command> query
(<xref linkend="sql-update-title" endterm="sql-update-title">)
should be run.
</para>
<para>
You must own the class in order to change its schema.
Renaming any part of the schema of a system
catalog is not permitted.
The <citetitle>PostgreSQL User's Guide</citetitle> has further
information on inheritance.
</para>