text: -- Copyright [1999-2015] Wellcome Trust Sanger Institute and the EMBL-European Bioinformatics Institute
  -- Copyright [2016-2017] 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_88_89_b.sql
  #
  # Title: Drop unique key on species_prefix column
  #
  # Description:
  #   Drop unique key on species_prefix column to allow species to share species_prefix, e.g: male and female naked mole rat
  
  ALTER TABLE species DROP INDEX species_prefix_idx;
  
  # Patch identifier
  INSERT INTO meta (species_id, meta_key, meta_value)
    VALUES (NULL, 'patch', 'patch_89_90_b.sql|Remove_species_prefix_uniqueness');
  
  