-- Copyright [1999-2015] Wellcome Trust Sanger Institute and the EMBL-European Bioinformatics Institute
-- Copyright [2016-2019] EMBL-European Bioinformatics Institute
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-- you may not use this file except in compliance with the License.
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--      http://www.apache.org/licenses/LICENSE-2.0
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# patch_15022018_h.sql
#
# Title: Adding genome_database_id column, update index and add delete cascade for genome_database_id in genome_variation
#
# Adding db_id to the genome_variation table, add it to the unique index. Add delete cascade for genome_database_id 
ALTER TABLE genome_variation ADD COLUMN genome_database_id int(10) unsigned NOT NULL;
ALTER TABLE genome_variation DROP INDEX id_type_key;
ALTER TABLE genome_variation ADD UNIQUE KEY id_type_key (genome_id,type,name,genome_database_id);
ALTER TABLE genome_variation ADD CONSTRAINT genome_variation_ibfk_2 FOREIGN KEY (genome_database_id) REFERENCES genome_database (genome_database_id) ON DELETE CASCADE;

