---
title: "ALTER USER MAPPING"
id: sql-alterusermapping
pg_version: "20devel"
---

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# ALTER USER MAPPING — change the definition of a user mapping

## Synopsis

```
ALTER USER MAPPING FOR { user_name | USER | CURRENT_ROLE | CURRENT_USER | SESSION_USER | PUBLIC }
    SERVER server_name
    OPTIONS ( [ ADD | SET | DROP ] option ['value'] [, ... ] )
```

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## Description

`ALTER USER MAPPING` changes the definition of a user mapping. 

The owner of a foreign server can alter user mappings for that server for any user. Also, a user can alter a user mapping for their own user name if `USAGE` privilege on the server has been granted to the user. 

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## Parameters

**`user_name`**

 User name of the mapping. `CURRENT_ROLE`, `CURRENT_USER`, and `USER` match the name of the current user. `PUBLIC` is used to match all present and future user names in the system. **`server_name`**

 Server name of the user mapping. **`OPTIONS ( [ ADD | SET | DROP ] option ['value'] [, ... ] )`**

 Change options for the user mapping. The new options override any previously specified options. `ADD`, `SET`, and `DROP` specify the action to be performed. `ADD` is assumed if no operation is explicitly specified. Option names must be unique; options are also validated by the server's foreign-data wrapper. <a id="id-1.9.3.45.7"></a>

## Examples

Change the password for user mapping `bob`, server `foo`: 
ALTER USER MAPPING FOR bob SERVER foo OPTIONS (SET password 'public');


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## Compatibility

`ALTER USER MAPPING` conforms to ISO/IEC 9075-9 (SQL/MED). There is a subtle syntax issue: The standard omits the `FOR` key word. Since both `CREATE USER MAPPING` and `DROP USER MAPPING` use `FOR` in analogous positions, and IBM DB2 (being the other major SQL/MED implementation) also requires it for `ALTER USER MAPPING`, PostgreSQL diverges from the standard here in the interest of consistency and interoperability. 

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## See Also

[CREATE USER MAPPING](sql-createusermapping.md), [DROP USER MAPPING](sql-dropusermapping.md)