DROP CREDENTIAL (Transact-SQL)
Removes a credential from the server.
DROP CREDENTIAL credential_name
Is the name of the credential to remove from the server.
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.
Requires ALTER ANY CREDENTIAL permission. If dropping a system credential, requires CONTROL SERVER permission.
The following example removes the credential called Saddles.
DROP CREDENTIAL Saddles; GO