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doc/man/create_view.l

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+.\" This is -*-nroff-*-
+.\" XXX standard disclaimer belongs here....
+.\" $Header: /cvsroot/pgsql/doc/man/Attic/create_view.l,v 1.1.1.1 1996/08/18 22:14:22 scrappy Exp $
+.TH "CREATE VIEW" SQL 11/05/95 Postgres95 Postgres95
+.SH NAME
+create view \(em construct a virtual class
+.SH SYNOPSIS
+.nf
+\fBcreate view\fR view_name \fBas\fR
+	\fBselect\fR expression1 [\fBas\fR attr_name1]
+	{, expression_i [\fBas\fR attr_namei]}
+	[\fBfrom\fR from.last]
+	[\fBwhere\fR qual]
+.fi
+.SH DESCRIPTION
+.BR "create view"
+will define a view of a class.  This view is not physically
+materialized; instead the rule system is used to support view
+processing as in [STON90].  Specifically, a query rewrite retrieve
+rule is automatically generated to support retrieve operations on
+views.  Then, the user can add as many update rules as desired to
+specify the processing of update operations to views.  See [STON90]
+for a detailed discussion of this point.
+.SH EXAMPLE
+.nf
+--
+--create a view consisting of toy department employees
+--
+create view toyemp as
+  	select e.name
+	from emp e
+	where e.dept = 'toy'
+.fi
+.nf
+--
+--Specify deletion semantics for toyemp
+--
+create rule example1 as
+	on delete to toyemp
+	do instead delete emp
+	where emp.oid = current.oid
+.fi
+.SH "SEE ALSO"
+create table(l), 
+create rule(l),