> For the complete documentation index, see [llms.txt](https://docs.postgresql.tw/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.postgresql.tw/reference/sql-commands/sql-alterconversion.md).

# ALTER CONVERSION

### ALTER CONVERSION

ALTER CONVERSION — change the definition of a conversion

### Synopsis

```

ALTER CONVERSION name RENAME TO new_name
ALTER CONVERSION name OWNER TO { new_owner | CURRENT_ROLE | CURRENT_USER | SESSION_USER }
ALTER CONVERSION name SET SCHEMA new_schema
```

### Description

`ALTER CONVERSION` changes the definition of a conversion.

You must own the conversion to use `ALTER CONVERSION`. To alter the owner, you must be able to `SET ROLE` to the new owning role, and that role must have `CREATE` privilege on the conversion's schema. (These restrictions enforce that altering the owner doesn't do anything you couldn't do by dropping and recreating the conversion. However, a superuser can alter ownership of any conversion anyway.)

### Parameters

*`name`* : The name (optionally schema-qualified) of an existing conversion.

*`new_name`* : The new name of the conversion.

*`new_owner`* : The new owner of the conversion.

*`new_schema`* : The new schema for the conversion.

### Examples

To rename the conversion `iso_8859_1_to_utf8` to `latin1_to_unicode`:

```

ALTER CONVERSION iso_8859_1_to_utf8 RENAME TO latin1_to_unicode;
```

To change the owner of the conversion `iso_8859_1_to_utf8` to `joe`:

```

ALTER CONVERSION iso_8859_1_to_utf8 OWNER TO joe;
```

### Compatibility

There is no `ALTER CONVERSION` statement in the SQL standard.

### See Also

[CREATE CONVERSION](/reference/sql-commands/sql-createconversion.md), [DROP CONVERSION](/reference/sql-commands/sql-dropconversion.md)

***

原文：[PostgreSQL 18.6 Documentation](https://www.postgresql.org/docs/18/sql-alterconversion.html)（英文原文，待翻譯）


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.postgresql.tw/reference/sql-commands/sql-alterconversion.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.