phpman > man > CREATE_VIEW(7)

CREATE VIEW(7)                     PostgreSQL 14.23 Documentation                     CREATE VIEW(7)



NAME
       CREATE_VIEW - define a new view

SYNOPSIS
       CREATE [ OR REPLACE ] [ TEMP | TEMPORARY ] [ RECURSIVE ] VIEW name [ ( column_name [, ...] ) ]
           [ WITH ( view_option_name [= view_option_value] [, ... ] ) ]
           AS query
           [ WITH [ CASCADED | LOCAL ] CHECK OPTION ]

DESCRIPTION
       CREATE VIEW defines a view of a query. The view is not physically materialized. Instead, the
       query is run every time the view is referenced in a query.

       CREATE OR REPLACE VIEW is similar, but if a view of the same name already exists, it is
       replaced. The new query must generate the same columns that were generated by the existing
       view query (that is, the same column names in the same order and with the same data types),
       but it may add additional columns to the end of the list. The calculations giving rise to the
       output columns may be completely different.

       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. Temporary
       views exist in a special schema, so a schema name cannot be given when creating a temporary
       view. The name of the view must be distinct from the name of any other view, table, sequence,
       index or foreign table in the same schema.

PARAMETERS
       TEMPORARY or TEMP
           If specified, the view is created as a temporary view. Temporary views are automatically
           dropped at the end of the current session. Existing permanent relations with the same
           name are not visible to the current session while the temporary view exists, unless they
           are referenced with schema-qualified names.

           If any of the tables referenced by the view are temporary, the view is created as a
           temporary view (whether TEMPORARY is specified or not).

       RECURSIVE
           Creates a recursive view. The syntax

               CREATE RECURSIVE VIEW [ schema . ] view_name (column_names) AS SELECT ...;

           is equivalent to

               CREATE VIEW [ schema . ] view_name AS WITH RECURSIVE view_name (column_names) AS (SELECT ...) SELECT column_names FROM view_name;

           A view column name list must be specified for a recursive view.

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

       column_name
           An optional list of names to be used for columns of the view. If not given, the column
           names are deduced from the query.

       WITH ( view_option_name [= view_option_value] [, ... ] )
           This clause specifies optional parameters for a view; the following parameters are
           supported:

           check_option (enum)
               This parameter may be either local or cascaded, and is equivalent to specifying WITH
               [ CASCADED | LOCAL ] CHECK OPTION (see below). This option can be changed on existing
               views using ALTER VIEW.

           security_barrier (boolean)
               This should be used if the view is intended to provide row-level security. See
               Section 41.5 for full details.

       query
           A SELECT or VALUES command which will provide the columns and rows of the view.

       WITH [ CASCADED | LOCAL ] CHECK OPTION
           This option controls the behavior of automatically updatable views. When this option is
           specified, INSERT and UPDATE commands on the view will be checked to ensure that new rows
           satisfy the view-defining condition (that is, the new rows are checked to ensure that
           they are visible through the view). If they are not, the update will be rejected. If the
           CHECK OPTION is not specified, INSERT and UPDATE commands on the view are allowed to
           create rows that are not visible through the view. The following check options are
           supported:

           LOCAL
               New rows are only checked against the conditions defined directly in the view itself.
               Any conditions defined on underlying base views are not checked (unless they also
               specify the CHECK OPTION).

           CASCADED
               New rows are checked against the conditions of the view and all underlying base
               views. If the CHECK OPTION is specified, and neither LOCAL nor CASCADED is specified,
               then CASCADED is assumed.

           The CHECK OPTION may not be used with RECURSIVE views.

           Note that the CHECK OPTION is only supported on views that are automatically updatable,
           and do not have INSTEAD OF triggers or INSTEAD rules. If an automatically updatable view
           is defined on top of a base view that has INSTEAD OF triggers, then the LOCAL CHECK
           OPTION may be used to check the conditions on the automatically updatable view, but the
           conditions on the base view with INSTEAD OF triggers will not be checked (a cascaded
           check option will not cascade down to a trigger-updatable view, and any check options
           defined directly on a trigger-updatable view will be ignored). If the view or any of its
           base relations has an INSTEAD rule that causes the INSERT or UPDATE command to be
           rewritten, then all check options will be ignored in the rewritten query, including any
           checks from automatically updatable views defined on top of the relation with the INSTEAD
           rule.

NOTES
       Use the DROP VIEW statement to drop views.

       Be careful that the names and types of the view's columns will be assigned the way you want.
       For example:

           CREATE VIEW vista AS SELECT 'Hello World';

       is bad form because the column name defaults to ?column?; also, the column data type defaults
       to text, which might not be what you wanted. Better style for a string literal in a view's
       result is something like:

           CREATE VIEW vista AS SELECT text 'Hello World' AS hello;

       Access to tables referenced in the view is determined by permissions of the view owner. In
       some cases, this can be used to provide secure but restricted access to the underlying
       tables. However, not all views are secure against tampering; see Section 41.5 for details.
       Functions called in the view are treated the same as if they had been called directly from
       the query using the view. Therefore the user of a view must have permissions to call all
       functions used by the view.

       When CREATE OR REPLACE VIEW is used on an existing view, only the view's defining SELECT rule
       is changed. Other view properties, including ownership, permissions, and non-SELECT rules,
       remain unchanged. You must own the view to replace it (this includes being a member of the
       owning role).

   Updatable Views
       Simple views are automatically updatable: the system will allow INSERT, UPDATE and DELETE
       statements to be used on the view in the same way as on a regular table. A view is
       automatically updatable if it satisfies all of the following conditions:

       •   The view must have exactly one entry in its FROM list, which must be a table or another
           updatable view.

       •   The view definition must not contain WITH, DISTINCT, GROUP BY, HAVING, LIMIT, or OFFSET
           clauses at the top level.

       •   The view definition must not contain set operations (UNION, INTERSECT or EXCEPT) at the
           top level.

       •   The view's select list must not contain any aggregates, window functions or set-returning
           functions.

       An automatically updatable view may contain a mix of updatable and non-updatable columns. A
       column is updatable if it is a simple reference to an updatable column of the underlying base
       relation; otherwise the column is read-only, and an error will be raised if an INSERT or
       UPDATE statement attempts to assign a value to it.

       If the view is automatically updatable the system will convert any INSERT, UPDATE or DELETE
       statement on the view into the corresponding statement on the underlying base relation.
       INSERT statements that have an ON CONFLICT UPDATE clause are fully supported.

       If an automatically updatable view contains a WHERE condition, the condition restricts which
       rows of the base relation are available to be modified by UPDATE and DELETE statements on the
       view. However, an UPDATE is allowed to change a row so that it no longer satisfies the WHERE
       condition, and thus is no longer visible through the view. Similarly, an INSERT command can
       potentially insert base-relation rows that do not satisfy the WHERE condition and thus are
       not visible through the view (ON CONFLICT UPDATE may similarly affect an existing row not
       visible through the view). The CHECK OPTION may be used to prevent INSERT and UPDATE commands
       from creating such rows that are not visible through the view.

       If an automatically updatable view is marked with the security_barrier property then all the
       view's WHERE conditions (and any conditions using operators which are marked as LEAKPROOF)
       will always be evaluated before any conditions that a user of the view has added. See
       Section 41.5 for full details. Note that, due to this, rows which are not ultimately returned
       (because they do not pass the user's WHERE conditions) may still end up being locked.
       EXPLAIN can be used to see which conditions are applied at the relation level (and therefore
       do not lock rows) and which are not.

       A more complex view that does not satisfy all these conditions is read-only by default: the
       system will not allow an insert, update, or delete on the view. You can get the effect of an
       updatable view by creating INSTEAD OF triggers on the view, which must convert attempted
       inserts, etc. on the view into appropriate actions on other tables. For more information see
       CREATE TRIGGER (CREATE_TRIGGER(7)). Another possibility is to create rules (see CREATE RULE
       (CREATE_RULE(7))), but in practice triggers are easier to understand and use correctly.

       Note that the user performing the insert, update or delete on the view must have the
       corresponding insert, update or delete privilege on the view. In addition the view's owner
       must have the relevant privileges on the underlying base relations, but the user performing
       the update does not need any permissions on the underlying base relations (see Section 41.5).

EXAMPLES
       Create a view consisting of all comedy films:

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

       This will create a view containing the columns that are in the film table at the time of view
       creation. Though * was used to create the view, columns added later to the table will not be
       part of the view.

       Create a view with LOCAL CHECK OPTION:

           CREATE VIEW universal_comedies AS
               SELECT *
               FROM comedies
               WHERE classification = 'U'
               WITH LOCAL CHECK OPTION;

       This will create a view based on the comedies view, showing only films with kind = 'Comedy'
       and classification = 'U'. Any attempt to INSERT or UPDATE a row in the view will be rejected
       if the new row doesn't have classification = 'U', but the film kind will not be checked.

       Create a view with CASCADED CHECK OPTION:

           CREATE VIEW pg_comedies AS
               SELECT *
               FROM comedies
               WHERE classification = 'PG'
               WITH CASCADED CHECK OPTION;

       This will create a view that checks both the kind and classification of new rows.

       Create a view with a mix of updatable and non-updatable columns:

           CREATE VIEW comedies AS
               SELECT f.*,
                      country_code_to_name(f.country_code) AS country,
                      (SELECT avg(r.rating)
                       FROM user_ratings r
                       WHERE r.film_id = f.id) AS avg_rating
               FROM films f
               WHERE f.kind = 'Comedy';

       This view will support INSERT, UPDATE and DELETE. All the columns from the films table will
       be updatable, whereas the computed columns country and avg_rating will be read-only.

       Create a recursive view consisting of the numbers from 1 to 100:

           CREATE RECURSIVE VIEW public.nums_1_100 (n) AS
               VALUES (1)
           UNION ALL
               SELECT n+1 FROM nums_1_100 WHERE n < 100;

       Notice that although the recursive view's name is schema-qualified in this CREATE, its
       internal self-reference is not schema-qualified. This is because the implicitly-created CTE's
       name cannot be schema-qualified.

COMPATIBILITY
       CREATE OR REPLACE VIEW is a PostgreSQL language extension. So is the concept of a temporary
       view. The WITH ( ... ) clause is an extension as well.

SEE ALSO
       ALTER VIEW (ALTER_VIEW(7)), DROP VIEW (DROP_VIEW(7)), CREATE MATERIALIZED VIEW
       (CREATE_MATERIALIZED_VIEW(7))



PostgreSQL 14.23                                2026                                  CREATE VIEW(7)