DROP CERTIFICATE (Transact-SQL)
Removes a certificate from the database.
DROP CERTIFICATE certificate_name
Is the unique name by which the certificate is known in the database.
Certificates can only be dropped if no entities are associated with them.
Requires CONTROL permission on the certificate.
The following example drops the certificate Shipping04 from the AdventureWorks2008R2 database.
USE AdventureWorks2008R2; DROP CERTIFICATE Shipping04;