-- Licensed to the Apache Software Foundation (ASF) under one or more
-- contributor license agreements.  See the NOTICE file distributed with
-- this work for additional information regarding copyright ownership.
-- The ASF licenses this file to You under the Apache License, Version 2.0
-- (the "License"); you may not use this file except in compliance with
-- the License.  You may obtain a copy of the License at
--
--     http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
BEGIN
	IF EXISTS(select * from SYS.SYSCOLUMNS where tname = 'x_policy' and cname in('guid','service','zone_id') THEN
		IF NOT EXISTS(select * from SYS.SYSCONSTRAINT where constraint_name = 'x_policy_UK_guid_service_zone') THEN
			ALTER TABLE dbo.x_policy ADD CONSTRAINT x_policy_UK_guid_service_zone UNIQUE NONCLUSTERED (guid,service,zone_id);
		END IF;
	END IF;
END
GO