text: -- Copyright [1999-2015] Wellcome Trust Sanger Institute and the EMBL-European Bioinformatics Institute
  -- Copyright [2016] 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.
  
  
  # A table for mapping variations to variation_sets
  CREATE TABLE IF NOT EXISTS variation_set_variation (
  	variation_id int(10) unsigned NOT NULL,
  	variation_set_id int(10) unsigned NOT NULL,
  	PRIMARY KEY (variation_id,variation_set_id),
  	KEY variation_set_idx (variation_set_id,variation_id)
  );
  
  # A table containing variation_set information  
  CREATE TABLE IF NOT EXISTS variation_set (
  	variation_set_id int(10) unsigned NOT NULL AUTO_INCREMENT,
  	name VARCHAR(255),
  	description TEXT,
  	PRIMARY KEY (variation_set_id),
  	KEY name_idx (name)
  );
   
  # A table containing relashionship between variation sets
  CREATE TABLE IF NOT EXISTS variation_set_structure (
  	variation_set_super int(10) unsigned NOT NULL,
  	variation_set_sub int(10) unsigned NOT NULL,
  	PRIMARY KEY (variation_set_super,variation_set_sub),
  	KEY sub_idx (variation_set_sub,variation_set_super)
  );
  
  # patch identifier
  INSERT INTO meta (species_id, meta_key, meta_value) VALUES (NULL,'patch', 'patch_56_57_e.sql|variation set tables');
  