DROP USER MAPPING
Function
DROP USER MAPPING drops a user mapping for a foreign server.
Syntax
DROP USER MAPPING [ IF EXISTS ] FOR { user_name | USER | CURRENT_USER | PUBLIC } SERVER server_name;
Parameter Description
- IF EXISTS - Reports a notice instead of an error if the user mapping does not exist. 
- user_name - Specifies user name of the mapping. - CURRENT_USER and USER match the name of the current user. PUBLIC is used to match all current and future user names in the system. 
- server_name - Specifies name of the server to which the user is mapped. 
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