<!--
doc/src/sgml/ref/alter_policy.sgml
PostgreSQL documentation
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<refentry id="sql-alterpolicy">
 <indexterm zone="sql-alterpolicy">
  <primary>ALTER POLICY</primary>
 </indexterm>

 <refmeta>
  <refentrytitle>ALTER POLICY</refentrytitle>
  <manvolnum>7</manvolnum>
  <refmiscinfo>SQL - Language Statements</refmiscinfo>
 </refmeta>

 <refnamediv>
  <refname>ALTER POLICY</refname>
  <refpurpose>change the definition of a row-level security policy</refpurpose>
 </refnamediv>

 <refsynopsisdiv>
<synopsis>
ALTER POLICY <replaceable class="parameter">name</replaceable> ON <replaceable class="parameter">table_name</replaceable> RENAME TO <replaceable class="parameter">new_name</replaceable>

ALTER POLICY <replaceable class="parameter">name</replaceable> ON <replaceable class="parameter">table_name</replaceable>
    [ TO { <replaceable class="parameter">role_name</replaceable> | PUBLIC | CURRENT_ROLE | CURRENT_USER | SESSION_USER } [, ...] ]
    [ USING ( <replaceable class="parameter">using_expression</replaceable> ) ]
    [ WITH CHECK ( <replaceable class="parameter">check_expression</replaceable> ) ]
</synopsis>
 </refsynopsisdiv>

 <refsect1>
  <title>Description</title>

  <para>
   <command>ALTER POLICY</command> changes the definition of an existing
   row-level security policy.  Note that <command>ALTER POLICY</command>
   only allows the set of roles to which the policy applies and the
   <literal>USING</literal> and <literal>WITH CHECK</literal> expressions to
   be modified.  To change other properties of a policy, such as the command
   to which it applies or whether it is permissive or restrictive, the policy
   must be dropped and recreated.
  </para>

  <para>
   To use <command>ALTER POLICY</command>, you must own the table that
   the policy applies to.
  </para>

  <para>
   In the second form of <command>ALTER POLICY</command>, the role list,
   <replaceable class="parameter">using_expression</replaceable>, and
   <replaceable class="parameter">check_expression</replaceable> are replaced
   independently if specified.  When one of those clauses is omitted, the
   corresponding