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Diffstat (limited to 'src/man/create_view.l')
-rw-r--r-- | src/man/create_view.l | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/src/man/create_view.l b/src/man/create_view.l new file mode 100644 index 00000000000..1b0bed76e1a --- /dev/null +++ b/src/man/create_view.l @@ -0,0 +1,45 @@ +.\" This is -*-nroff-*- +.\" XXX standard disclaimer belongs here.... +.\" $Header: /cvsroot/pgsql/src/man/Attic/create_view.l,v 1.1 1996/11/14 10:16:17 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), |