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Department of second thoughts: make checks for replacing a view slightly

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more flexible, and improve the error reporting.  Also, add documentation
for REPLACE RULE/VIEW.
This commit is contained in:
Tom Lane
2002-09-02 20:04:40 +00:00
parent b4d24d78a9
commit 8f60f43f2e
5 changed files with 84 additions and 24 deletions
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21
doc/src/sgml/ref/create_view.sgml
View File

@@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_view.sgml,v 1.18 2002/05/18 15:44:47 petere Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_view.sgml,v 1.19 2002/09/02 20:04:39 tgl Exp $
PostgreSQL documentation
-->
@@ -21,7 +21,7 @@ PostgreSQL documentation
<date>2000-03-25</date>
</refsynopsisdivinfo>
<synopsis>
CREATE VIEW <replaceable class="PARAMETER">view</replaceable> [ ( <replaceable
CREATE [ OR REPLACE ] VIEW <replaceable class="PARAMETER">view</replaceable> [ ( <replaceable
class="PARAMETER">column name list</replaceable> ) ] AS SELECT <replaceable class="PARAMETER">query</replaceable>
</synopsis>
@@ -132,13 +132,21 @@ CREATE VIEW vista AS SELECT text 'Hello World'
<title>
Description
</title>
<para>
<command>CREATE VIEW</command> will define a view of a query.
<command>CREATE VIEW</command> defines a view of a query.
The view is not physically materialized. Instead, a query
rewrite rule (an <literal>ON SELECT</> rule) is automatically generated to
support SELECT operations on views.
</para>
<para>
<command>CREATE OR REPLACE VIEW</command> is similar, but if a view
of the same name already exists, it is replaced. You can only replace
a view with a new query that generates the identical set of columns
(i.e., same column names and data types).
</para>
<para>
If a schema name is given (for example, <literal>CREATE VIEW
myschema.myview ...</>) then the view is created in the
@@ -206,6 +214,7 @@ SELECT * FROM kinds;
<title>
SQL92
</title>
<para>
SQL92 specifies some additional capabilities for the
<command>CREATE VIEW</command> statement:
@@ -253,6 +262,12 @@ CREATE VIEW <replaceable class="parameter">view</replaceable> [ <replaceable cla
</varlistentry>
</variablelist>
</para>
<para>
<command>CREATE OR REPLACE VIEW</command> is a
<productname>PostgreSQL</productname> language extension.
</para>
</refsect2>
</refsect1>
</refentry>