store synonym xref separately

misc-scripts/ontology/sql/patch_84_85_c.sql

+-- Copyright [1999-2016] Wellcome Trust Sanger Institute and the EMBL-European Bioinformatics Institute
+-- 
+-- Licensed 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.
+
+-- patch_84_85_c.sql
+--
+-- Title: Store synonym dbxref separately 
+--
+-- Description:
+--   Add a column to synonym to hold the dbxref
+
+
+ALTER TABLE synonym
+ADD COLUMN dbxref VARCHAR(64)  NULL ;
+
+-- Patch identifier
+INSERT INTO meta (meta_key, meta_value)
+  VALUES ('patch', 'patch_84_85_c.sql| add synonym dbxref');