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Applies to: 
SQL Server
Azure SQL Managed Instance
Removes a credential from the server.
Transact-SQL syntax conventions
Syntax
DROP CREDENTIAL credential_name
Arguments
credential_name
The name of the credential to remove from the server.
Remarks
To drop the secret associated with a credential without dropping the credential itself, use ALTER CREDENTIAL.
Information about credentials is visible in the sys.credentials catalog view.
Proxies are associated with a credential. Deleting a credential that is used by a proxy leaves the associated proxy in an unusable state. When dropping a credential used by a proxy, delete the proxy (by using sp_delete_proxy) and recreate the associated proxy (by using sp_add_proxy).
Permissions
Requires ALTER ANY CREDENTIAL permission. If dropping a system credential, requires CONTROL SERVER permission.
Examples
The following example removes the credential called Saddles.
DROP CREDENTIAL Saddles;
GO