-- 지정판매소에 동코드(code_detail 종류 D) 저장 컬럼 추가
-- ds_gugun_code(구코드) 다음에 ds_dong_code(동코드)를 둔다.
-- 실행: mysql -u jongryangje -p jongryangje_dev < writable/database/designated_shop_add_dong_code.sql
-- 멱등 실행(이미 있으면 건너뜀).

SET @db = DATABASE();

SET @sql = IF(
  (SELECT COUNT(*) FROM information_schema.COLUMNS
     WHERE TABLE_SCHEMA = @db AND TABLE_NAME = 'designated_shop' AND COLUMN_NAME = 'ds_dong_code') > 0,
  'SELECT ''ds_dong_code already exists'' AS msg',
  'ALTER TABLE `designated_shop` ADD COLUMN `ds_dong_code` VARCHAR(20) NOT NULL DEFAULT '''' COMMENT ''동코드 code_detail(D)'' AFTER `ds_gugun_code`'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;