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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>CREATE VIEW</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="sql-createusermapping.html" title="CREATE USER MAPPING" /><link rel="next" href="sql-deallocate.html" title="DEALLOCATE" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">CREATE VIEW</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="sql-createusermapping.html" title="CREATE USER MAPPING">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="sql-commands.html" title="SQL Commands">Up</a></td><th width="60%" align="center">SQL Commands</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="sql-deallocate.html" title="DEALLOCATE">Next</a></td></tr></table><hr /></div><div class="refentry" id="SQL-CREATEVIEW"><div class="titlepage"></div><a id="id-1.9.3.97.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle">CREATE VIEW</span></h2><p>CREATE VIEW — define a new view</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">
CREATE [ OR REPLACE ] [ TEMP | TEMPORARY ] [ RECURSIVE ] VIEW <em class="replaceable"><code>name</code></em> [ ( <em class="replaceable"><code>column_name</code></em> [, ...] ) ]
    [ WITH ( <em class="replaceable"><code>view_option_name</code></em> [= <em class="replaceable"><code>view_option_value</code></em>] [, ... ] ) ]
    AS <em class="replaceable"><code>query</code></em>
    [ WITH [ CASCADED | LOCAL ] CHECK OPTION ]
</pre></div><div class="refsect1" id="id-1.9.3.97.5"><h2>Description</h2><p>
   <code class="command">CREATE VIEW</code> 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.
  </p><p>
   <code class="command">CREATE OR REPLACE VIEW</code> 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.
  </p><p>
   If a schema name is given (for example, <code class="literal">CREATE VIEW
   myschema.myview ...</code>) 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 relation (table, sequence, index, view,
   materialized view, or foreign table) in the same schema.
  </p></div><div class="refsect1" id="id-1.9.3.97.6"><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="literal">TEMPORARY</code> or <code class="literal">TEMP</code></span></dt><dd><p>
      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.
     </p><p>
      If any of the tables referenced by the view are temporary,
      the view is created as a temporary view (whether
      <code class="literal">TEMPORARY</code> is specified or not).
     </p></dd><dt><span class="term"><code class="literal">RECURSIVE</code>
      <a id="id-1.9.3.97.6.2.2.1.2" class="indexterm"></a>
    </span></dt><dd><p>
      Creates a recursive view.  The syntax
</p><pre class="synopsis">
CREATE RECURSIVE VIEW [ <em class="replaceable"><code>schema</code></em> . ] <em class="replaceable"><code>view_name</code></em> (<em class="replaceable"><code>column_names</code></em>) AS SELECT <em class="replaceable"><code>...</code></em>;
</pre><p>
      is equivalent to
</p><pre class="synopsis">
CREATE VIEW [ <em class="replaceable"><code>schema</code></em> . ] <em class="replaceable"><code>view_name</code></em> AS WITH RECURSIVE <em class="replaceable"><code>view_name</code></em> (<em class="replaceable"><code>column_names</code></em>) AS (SELECT <em class="replaceable"><code>...</code></em>) SELECT <em class="replaceable"><code>column_names</code></em> FROM <em class="replaceable"><code>view_name</code></em>;
</pre><p>
      A view column name list must be specified for a recursive view.
     </p></dd><dt><span class="term"><em class="replaceable"><code>name</code></em></span></dt><dd><p>
      The name (optionally schema-qualified) of a view to be created.
     </p></dd><dt><span class="term"><em class="replaceable"><code>column_name</code></em></span></dt><dd><p>
      An optional list of names to be used for columns of the view.
      If not given, the column names are deduced from the query.
     </p></dd><dt><span class="term"><code class="literal">WITH ( <em class="replaceable"><code>view_option_name</code></em> [= <em class="replaceable"><code>view_option_value</code></em>] [, ... ] )</code></span></dt><dd><p>
      This clause specifies optional parameters for a view; the following
      parameters are supported:

      </p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="literal">check_option</code> (<code class="type">enum</code>)</span></dt><dd><p>
          This parameter may be either <code class="literal">local</code> or
          <code class="literal">cascaded</code>, and is equivalent to specifying
          <code class="literal">WITH [ CASCADED | LOCAL ] CHECK OPTION</code> (see below).
         </p></dd><dt><span class="term"><code class="literal">security_barrier</code> (<code class="type">boolean</code>)</span></dt><dd><p>
          This should be used if the view is intended to provide row-level
          security.  See <a class="xref" href="rules-privileges.html" title="41.5. Rules and Privileges">Section 41.5</a> for full details.
         </p></dd><dt><span class="term"><code class="literal">security_invoker</code> (<code class="type">boolean</code>)</span></dt><dd><p>
          This option causes the underlying base relations to be checked
          against the privileges of the user of the view rather than the view
          owner.  See the notes below for full details.
         </p></dd></dl></div><p>

      All of the above options can be changed on existing views using <a class="link" href="sql-alterview.html" title="ALTER VIEW"><code class="command">ALTER VIEW</code></a>.
     </p></dd><dt><span class="term"><em class="replaceable"><code>query</code></em></span></dt><dd><p>
      A <a class="link" href="sql-select.html" title="SELECT"><code class="command">SELECT</code></a> or
      <a class="link" href="sql-values.html" title="VALUES"><code class="command">VALUES</code></a> command
      which will provide the columns and rows of the view.
     </p></dd><dt><span class="term"><code class="literal">WITH [ CASCADED | LOCAL ] CHECK OPTION</code>
      <a id="id-1.9.3.97.6.2.7.1.2" class="indexterm"></a>
      <a id="id-1.9.3.97.6.2.7.1.3" class="indexterm"></a>
    </span></dt><dd><p>
      This option controls the behavior of automatically updatable views.  When
      this option is specified, <code class="command">INSERT</code> and <code class="command">UPDATE</code>
      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 <code class="literal">CHECK OPTION</code> is not specified,
      <code class="command">INSERT</code> and <code class="command">UPDATE</code> commands on the view are
      allowed to create rows that are not visible through the view.  The
      following check options are supported:

      </p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="literal">LOCAL</code></span></dt><dd><p>
          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 <code class="literal">CHECK OPTION</code>).
         </p></dd><dt><span class="term"><code class="literal">CASCADED</code></span></dt><dd><p>
          New rows are checked against the conditions of the view and all
          underlying base views.  If the <code class="literal">CHECK OPTION</code> is specified,
          and neither <code class="literal">LOCAL</code> nor <code class="literal">CASCADED</code> is specified,
          then <code class="literal">CASCADED</code> is assumed.
         </p></dd></dl></div><p>
     </p><p>
      The <code class="literal">CHECK OPTION</code> may not be used with <code class="literal">RECURSIVE</code>
      views.
     </p><p>
      Note that the <code class="literal">CHECK OPTION</code> is only supported on views that
      are automatically updatable, and do not have <code class="literal">INSTEAD OF</code>
      triggers or <code class="literal">INSTEAD</code> rules.  If an automatically updatable
      view is defined on top of a base view that has <code class="literal">INSTEAD OF</code>
      triggers, then the <code class="literal">LOCAL CHECK OPTION</code> may be used to check
      the conditions on the automatically updatable view, but the conditions
      on the base view with <code class="literal">INSTEAD OF</code> 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 <code class="literal">INSTEAD</code> rule that causes the
      <code class="command">INSERT</code> or <code class="command">UPDATE</code> 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 <code class="literal">INSTEAD</code> rule.
     </p></dd></dl></div></div><div class="refsect1" id="id-1.9.3.97.7"><h2>Notes</h2><p>
    Use the <a class="link" href="sql-dropview.html" title="DROP VIEW"><code class="command">DROP VIEW</code></a>
    statement to drop views.
   </p><p>
    Be careful that the names and types of the view's columns will be
    assigned the way you want.  For example:
</p><pre class="programlisting">
CREATE VIEW vista AS SELECT 'Hello World';
</pre><p>
    is bad form because the column name defaults to <code class="literal">?column?</code>;
    also, the column data type defaults to <code class="type">text</code>, which might not
    be what you wanted.  Better style for a string literal in a view's
    result is something like:
</p><pre class="programlisting">
CREATE VIEW vista AS SELECT text 'Hello World' AS hello;
</pre><p>
   </p><p>
    By default, access to the underlying base relations referenced in the view
    is determined by the 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 <a class="xref" href="rules-privileges.html" title="41.5. Rules and Privileges">Section 41.5</a> for details.
   </p><p>
    If the view has the <code class="literal">security_invoker</code> property set to
    <code class="literal">true</code>, access to the underlying base relations is
    determined by the permissions of the user executing the query, rather than
    the view owner.  Thus, the user of a security invoker view must have the
    relevant permissions on the view and its underlying base relations.
   </p><p>
    If any of the underlying base relations is a security invoker view, it
    will be treated as if it had been accessed directly from the original
    query.  Thus, a security invoker view will always check its underlying
    base relations using the permissions of the current user, even if it is
    accessed from a view without the <code class="literal">security_invoker</code>
    property.
   </p><p>
    If any of the underlying base relations has
    <a class="link" href="ddl-rowsecurity.html" title="5.8. Row Security Policies">row-level security</a> enabled, then
    by default, the row-level security policies of the view owner are applied,
    and access to any additional relations referred to by those policies is
    determined by the permissions of the view owner.  However, if the view has
    <code class="literal">security_invoker</code> set to <code class="literal">true</code>, then
    the policies and permissions of the invoking user are used instead, as if
    the base relations had been referenced directly from the query using the
    view.
   </p><p>
    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.
    Functions in the view are executed with the privileges of the user
    executing the query or the function owner, depending on whether the
    functions are defined as <code class="literal">SECURITY INVOKER</code> or
    <code class="literal">SECURITY DEFINER</code>.  Thus, for example, calling
    <code class="literal">CURRENT_USER</code> directly in a view will always return the
    invoking user, not the view owner.  This is not affected by the view's
    <code class="literal">security_invoker</code> setting, and so a view with
    <code class="literal">security_invoker</code> set to <code class="literal">false</code> is
    <span class="emphasis"><em>not</em></span> equivalent to a
    <code class="literal">SECURITY DEFINER</code> function and those concepts should not
    be confused.
   </p><p>
    The user creating or replacing a view must have <code class="literal">USAGE</code>
    privileges on any schemas referred to in the view query, in order to look
    up the referenced objects in those schemas.  Note, however, that this
    lookup only happens when the view is created or replaced.  Therefore, the
    user of the view only requires the <code class="literal">USAGE</code> privilege on
    the schema containing the view, not on the schemas referred to in the view
    query, even for a security invoker view.
   </p><p>
    When <code class="command">CREATE OR REPLACE VIEW</code> is used on an existing
    view, only the view's defining SELECT rule, plus any
    <code class="literal">WITH ( ... )</code> parameters and its
    <code class="literal">CHECK OPTION</code> are 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).
   </p><div class="refsect2" id="SQL-CREATEVIEW-UPDATABLE-VIEWS"><h3>Updatable Views</h3><a id="id-1.9.3.97.7.11.2" class="indexterm"></a><p>
    Simple views are automatically updatable: the system will allow
    <code class="command">INSERT</code>, <code class="command">UPDATE</code> and <code class="command">DELETE</code> 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:

    </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>
       The view must have exactly one entry in its <code class="literal">FROM</code> list,
       which must be a table or another updatable view.
      </p></li><li class="listitem"><p>
       The view definition must not contain <code class="literal">WITH</code>,
       <code class="literal">DISTINCT</code>, <code class="literal">GROUP BY</code>, <code class="literal">HAVING</code>,
       <code class="literal">LIMIT</code>, or <code class="literal">OFFSET</code> clauses at the top level.
      </p></li><li class="listitem"><p>
       The view definition must not contain set operations (<code class="literal">UNION</code>,
       <code class="literal">INTERSECT</code> or <code class="literal">EXCEPT</code>) at the top level.
      </p></li><li class="listitem"><p>
       The view's select list must not contain any aggregates, window functions
       or set-returning functions.
      </p></li></ul></div><p>
   </p><p>
    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 <code class="command">INSERT</code>
    or <code class="command">UPDATE</code> statement attempts to assign a value to it.
   </p><p>
    If the view is automatically updatable the system will convert any
    <code class="command">INSERT</code>, <code class="command">UPDATE</code> or <code class="command">DELETE</code> statement
    on the view into the corresponding statement on the underlying base
    relation.  <code class="command">INSERT</code> statements that have an <code class="literal">ON
    CONFLICT UPDATE</code> clause are fully supported.
   </p><p>
    If an automatically updatable view contains a <code class="literal">WHERE</code>
    condition, the condition restricts which rows of the base relation are
    available to be modified by <code class="command">UPDATE</code> and <code class="command">DELETE</code>
    statements on the view.  However, an <code class="command">UPDATE</code> is allowed to
    change a row so that it no longer satisfies the <code class="literal">WHERE</code>
    condition, and thus is no longer visible through the view.  Similarly,
    an <code class="command">INSERT</code> command can potentially insert base-relation rows
    that do not satisfy the <code class="literal">WHERE</code> condition and thus are not
    visible through the view (<code class="literal">ON CONFLICT UPDATE</code> may
    similarly affect an existing row not visible through the view).
    The <code class="literal">CHECK OPTION</code> may be used to prevent
    <code class="command">INSERT</code> and <code class="command">UPDATE</code> commands from creating
    such rows that are not visible through the view.
   </p><p>
    If an automatically updatable view is marked with the
    <code class="literal">security_barrier</code> property then all the view's <code class="literal">WHERE</code>
    conditions (and any conditions using operators which are marked as <code class="literal">LEAKPROOF</code>)
    will always be evaluated before any conditions that a user of the view has
    added.   See <a class="xref" href="rules-privileges.html" title="41.5. Rules and Privileges">Section 41.5</a> for full details.  Note that,
    due to this, rows which are not ultimately returned (because they do not
    pass the user's <code class="literal">WHERE</code> conditions) may still end up being locked.
    <code class="command">EXPLAIN</code> can be used to see which conditions are
    applied at the relation level (and therefore do not lock rows) and which are
    not.
   </p><p>
    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 <code class="literal">INSTEAD OF</code> triggers on the view, which must
    convert attempted inserts, etc. on the view into appropriate actions
    on other tables.  For more information see <a class="xref" href="sql-createtrigger.html" title="CREATE TRIGGER"><span class="refentrytitle">CREATE TRIGGER</span></a>.  Another possibility is to create rules
    (see <a class="xref" href="sql-createrule.html" title="CREATE RULE"><span class="refentrytitle">CREATE RULE</span></a>), but in practice triggers are
    easier to understand and use correctly.
   </p><p>
    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, by default, the view's owner must have the relevant
    privileges on the underlying base relations, whereas the user performing
    the update does not need any permissions on the underlying base relations
    (see <a class="xref" href="rules-privileges.html" title="41.5. Rules and Privileges">Section 41.5</a>).  However, if the view has
    <code class="literal">security_invoker</code> set to <code class="literal">true</code>, the
    user performing the update, rather than the view owner, must have the
    relevant privileges on the underlying base relations.
   </p></div></div><div class="refsect1" id="id-1.9.3.97.8"><h2>Examples</h2><p>
   Create a view consisting of all comedy films:

</p><pre class="programlisting">
CREATE VIEW comedies AS
    SELECT *
    FROM films
    WHERE kind = 'Comedy';
</pre><p>
   This will create a view containing the columns that are in the
   <code class="literal">film</code> table at the time of view creation.  Though
   <code class="literal">*</code> was used to create the view, columns added later to
   the table will not be part of the view.
  </p><p>
   Create a view with <code class="literal">LOCAL CHECK OPTION</code>:

</p><pre class="programlisting">
CREATE VIEW universal_comedies AS
    SELECT *
    FROM comedies
    WHERE classification = 'U'
    WITH LOCAL CHECK OPTION;
</pre><p>
   This will create a view based on the <code class="literal">comedies</code> view, showing
   only films with <code class="literal">kind = 'Comedy'</code> and
   <code class="literal">classification = 'U'</code>. Any attempt to <code class="command">INSERT</code> or
   <code class="command">UPDATE</code> a row in the view will be rejected if the new row
   doesn't have <code class="literal">classification = 'U'</code>, but the film
   <code class="literal">kind</code> will not be checked.
  </p><p>
   Create a view with <code class="literal">CASCADED CHECK OPTION</code>:

</p><pre class="programlisting">
CREATE VIEW pg_comedies AS
    SELECT *
    FROM comedies
    WHERE classification = 'PG'
    WITH CASCADED CHECK OPTION;
</pre><p>
   This will create a view that checks both the <code class="literal">kind</code> and
   <code class="literal">classification</code> of new rows.
  </p><p>
   Create a view with a mix of updatable and non-updatable columns:

</p><pre class="programlisting">
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';
</pre><p>
   This view will support <code class="command">INSERT</code>, <code class="command">UPDATE</code> and
   <code class="command">DELETE</code>.  All the columns from the <code class="literal">films</code> table will
   be updatable, whereas the computed columns <code class="literal">country</code> and
   <code class="literal">avg_rating</code> will be read-only.
  </p><p>
   Create a recursive view consisting of the numbers from 1 to 100:
</p><pre class="programlisting">
CREATE RECURSIVE VIEW public.nums_1_100 (n) AS
    VALUES (1)
UNION ALL
    SELECT n+1 FROM nums_1_100 WHERE n &lt; 100;
</pre><p>
   Notice that although the recursive view's name is schema-qualified in this
   <code class="command">CREATE</code>, its internal self-reference is not schema-qualified.
   This is because the implicitly-created CTE's name cannot be
   schema-qualified.
  </p></div><div class="refsect1" id="id-1.9.3.97.9"><h2>Compatibility</h2><p>
   <code class="command">CREATE OR REPLACE VIEW</code> is a
   <span class="productname">PostgreSQL</span> language extension.
   So is the concept of a temporary view.
   The <code class="literal">WITH ( ... )</code> clause is an extension as well, as are
   security barrier views and security invoker views.
  </p></div><div class="refsect1" id="id-1.9.3.97.10"><h2>See Also</h2><span class="simplelist"><a class="xref" href="sql-alterview.html" title="ALTER VIEW"><span class="refentrytitle">ALTER VIEW</span></a>, <a class="xref" href="sql-dropview.html" title="DROP VIEW"><span class="refentrytitle">DROP VIEW</span></a>, <a class="xref" href="sql-creatematerializedview.html" title="CREATE MATERIALIZED VIEW"><span class="refentrytitle">CREATE MATERIALIZED VIEW</span></a></span></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="sql-createusermapping.html" title="CREATE USER MAPPING">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="sql-commands.html" title="SQL Commands">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="sql-deallocate.html" title="DEALLOCATE">Next</a></td></tr><tr><td width="40%" align="left" valign="top">CREATE USER MAPPING </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="40%" align="right" valign="top"> DEALLOCATE</td></tr></table></div></body></html>