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1st chunk of `doc/src/sgml/ref/alter_routine.sgml`
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doc/src/sgml/ref/alter_routine.sgml
PostgreSQL documentation
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<refentry id="sql-alterroutine">
 <indexterm zone="sql-alterroutine">
  <primary>ALTER ROUTINE</primary>
 </indexterm>

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

 <refnamediv>
  <refname>ALTER ROUTINE</refname>
  <refpurpose>change the definition of a routine</refpurpose>
 </refnamediv>

 <refsynopsisdiv>
<synopsis>
ALTER ROUTINE <replaceable>name</replaceable> [ ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] ) ]
    <replaceable class="parameter">action</replaceable> [ ... ] [ RESTRICT ]
ALTER ROUTINE <replaceable>name</replaceable> [ ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] ) ]
    RENAME TO <replaceable>new_name</replaceable>
ALTER ROUTINE <replaceable>name</replaceable> [ ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] ) ]
    OWNER TO { <replaceable>new_owner</replaceable> | CURRENT_ROLE | CURRENT_USER | SESSION_USER }
ALTER ROUTINE <replaceable>name</replaceable> [ ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] ) ]
    SET SCHEMA <replaceable>new_schema</replaceable>
ALTER ROUTINE <replaceable>name</replaceable> [ ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] ) ]
    [ NO ] DEPENDS ON EXTENSION <replaceable>extension_name</replaceable>

<phrase>where <replaceable class="parameter">action</replaceable> is one of:</phrase>

    IMMUTABLE | STABLE | VOLATILE
    [ NOT ] LEAKPROOF
    [ EXTERNAL ] SECURITY INVOKER | [ EXTERNAL ] SECURITY
Title: ALTER ROUTINE: Changing Routine Definitions
Summary
This section of the PostgreSQL documentation describes the ALTER ROUTINE command, which is used to modify the definition of a routine (function or procedure). It covers renaming routines, changing ownership, setting the schema, managing dependencies on extensions, and altering properties like volatility and security.