PostgreSQL 8.4.2 Documentation
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# DROP USER MAPPING

## Name

DROP USER MAPPING -- remove a user mapping for a foreign server

## Synopsis

    DROP USER MAPPING [ IF EXISTS ] FOR { username | USER | CURRENT_USER | PUBLIC } SERVER servername

## Description

`DROP USER MAPPING` removes an existing user mapping from foreign server.

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

## Parameters

`IF EXISTS`

  Do not throw an error if the user mapping does not exist. A notice is issued in this case.

`username`

  User name of the mapping. `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.

`servername`

  Server name of the user mapping.

## Examples

Drop a user mapping `bob`, server `foo` if it exists:

    DROP USER MAPPING IF EXISTS FOR bob SERVER foo;

## Compatibility

`DROP USER MAPPING` conforms to ISO/IEC 9075-9 (SQL/MED). The `IF EXISTS` clause is a PostgreSQL extension.

## See Also

CREATE USER MAPPING, ALTER USER MAPPING

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