SET @current_schema := DATABASE();

SET @add_voice_room_rocket_reward_copies_sql := IF(
  NOT EXISTS (
    SELECT 1
    FROM information_schema.columns
    WHERE table_schema = @current_schema
      AND table_name = 'voice_room_rocket_reward_config'
      AND column_name = 'reward_copies'
  ),
  'ALTER TABLE `voice_room_rocket_reward_config` ADD COLUMN `reward_copies` int NOT NULL DEFAULT 1 COMMENT ''IN_ROOM 本奖励每次发射可发放份数'' AFTER `expire_days`',
  'SELECT 1'
);
PREPARE add_voice_room_rocket_reward_copies_stmt FROM @add_voice_room_rocket_reward_copies_sql;
EXECUTE add_voice_room_rocket_reward_copies_stmt;
DEALLOCATE PREPARE add_voice_room_rocket_reward_copies_stmt;