text: -- Copyright [1999-2015] Wellcome Trust Sanger Institute and the EMBL-European Bioinformatics Institute
  -- Copyright [2016-2019] 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_86_87_c.sql
  #
  # Title: DATETIME DEFAULT NULL 
  #
  # Description:
  # Later MySQLs no longer accept 0 in datetime fields and CURRENT_TIMESTAMP was introduced for dynamic default value.
  # Older MySQLs do not support CURRENT_TIMESTAMP. To be able to support both, DATETIME DEFAULT is set to NULL
  
  ALTER TABLE genome_statistics MODIFY COLUMN timestamp DATETIME NULL DEFAULT NULL;
  ALTER TABLE analysis MODIFY COLUMN created DATETIME NULL DEFAULT NULL;
  ALTER TABLE exon MODIFY COLUMN created_date DATETIME NULL DEFAULT NULL;
  ALTER TABLE exon MODIFY COLUMN modified_date DATETIME NULL DEFAULT NULL;
  ALTER TABLE gene MODIFY COLUMN created_date DATETIME NULL DEFAULT NULL;
  ALTER TABLE gene MODIFY COLUMN modified_date DATETIME NULL DEFAULT NULL;
  ALTER TABLE transcript MODIFY COLUMN created_date DATETIME NULL DEFAULT NULL;
  ALTER TABLE transcript MODIFY COLUMN modified_date DATETIME NULL DEFAULT NULL;
  ALTER TABLE translation MODIFY COLUMN created_date DATETIME NULL DEFAULT NULL;
  ALTER TABLE translation MODIFY COLUMN modified_date DATETIME NULL DEFAULT NULL;
  ALTER TABLE operon MODIFY COLUMN created_date DATETIME NULL DEFAULT NULL;
  ALTER TABLE operon MODIFY COLUMN modified_date DATETIME NULL DEFAULT NULL;
  ALTER TABLE operon_transcript MODIFY COLUMN created_date DATETIME NULL DEFAULT NULL;
  ALTER TABLE operon_transcript MODIFY COLUMN modified_date DATETIME NULL DEFAULT NULL;
  
  # Patch identifier
  INSERT INTO meta (species_id, meta_key, meta_value)
    VALUES (NULL, 'patch', 'patch_86_87_c.sql|datetime_default_NULL');
  