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CREATE VIEW(7)				   SQL Commands 			   CREATE VIEW(7)

       CREATE VIEW - define a new view

       CREATE [ OR REPLACE ] VIEW view [ ( column name list ) ] AS SELECT query

       view   The name (optionally schema-qualified) of a view to be created.

       column name list
	      An  optional  list  of  names  to be used for columns of the view.  If given, these
	      names override the column names that would be deduced from the SQL query.

       query  An SQL query (that is, a SELECT statement) which will provide the columns and  rows
	      of the view.

	      Refer to SELECT [select(7)] for more information about valid arguments.

	      The message returned if the view is successfully created.

       ERROR: Relation 'view' already exists
	      This error occurs if the view specified already exists in the database.

       WARNING: Attribute 'column' has an unknown type
	      The view will be created having a column with an unknown type if you do not specify
	      it. For example, the following command gives a warning:

	      CREATE VIEW vista AS SELECT 'Hello World'

	      whereas this command does not:

	      CREATE VIEW vista AS SELECT text 'Hello World'

       CREATE VIEW defines a view of a query.  The view is not physically materialized.  Instead,
       a  query  rewrite  rule	(an  ON SELECT rule) is automatically generated to support SELECT
       operations on views.

       CREATE OR REPLACE VIEW 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).

       If a schema name is given (for example, CREATE VIEW myschema.myview ...) then the view  is
       created in the specified schema. Otherwise it is created in the current schema (the one at
       the front of the search path; see CURRENT_SCHEMA()).  The view name must be distinct  from
       the name of any other view, table, sequence, or index in the same schema.

       Currently,  views are read only: the system will not allow an insert, update, or delete on
       a view. You can get the effect of  an  updatable  view  by  creating  rules  that  rewrite
       inserts,  etc.  on the view into appropriate actions on other tables. For more information
       see CREATE RULE [create_rule(7)].

       Use the DROP VIEW statement to drop views.

       Create a view consisting of all Comedy films:

       CREATE VIEW kinds AS
	   SELECT *
	   FROM films
	   WHERE kind = 'Comedy';

       SELECT * FROM kinds;

	code  | 	  title 	  | did | date_prod  |	kind  | len
	UA502 | Bananas 		  | 105 | 1971-07-13 | Comedy | 01:22
	C_701 | There's a Girl in my Soup | 107 | 1970-06-11 | Comedy | 01:36
       (2 rows)

       SQL92 specifies some additional capabilities for the CREATE VIEW statement:

       CREATE VIEW view [ column [, ...] ]
	   AS SELECT expression [ AS colname ] [, ...]
	   FROM table [ WHERE condition ]

       The optional clauses for the full SQL92 command are:

	      This option is to do with updatable views.  All INSERT and UPDATE commands  on  the
	      view will be checked to ensure data satisfy the view-defining condition. If they do
	      not, the update will be rejected.

       LOCAL  Check for integrity on this view.

	      Check for integrity on this view and on any dependent view. CASCADE is  assumed  if
	      neither CASCADE nor LOCAL is specified.

       CREATE OR REPLACE VIEW is a PostgreSQL language extension.

SQL - Language Statements		    2002-11-22				   CREATE VIEW(7)
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