SQL 특수Query
-- 특수Query -- CASE SELECT EMPLOYEE_ID, FIRST_NAME, PHONE_NUMBER, CASE SUBSTR(PHONE_NUMBER, 1, 3) WHEN '515' THEN '서울' WHEN '590' THEN '부산' WHEN '659' THEN '광주' WHEN '603' THEN '대전' ELSE '기타' END AS "지역" FROM EMPLOYEES; SELECT EMPLOYEE_ID, FIRST_NAME, PHONE_NUMBER, CASE WHEN SUBSTR(PHONE_NUMBER, 1, 3) = '515' THEN '서울' WHEN SUBSTR(PHONE_NUMBER, 1, 3) = '590' THEN '부산' WHEN SUBSTR(PHONE_NUMBER, 1,..