[ORACLE] 테이블 컬럼 데이터타입 확인
SELECT a.TABLE_NAME, c.COMMENTS, a.COLUMN_NAME, b.COMMENTS, a.DATA_TYPE, a.DATA_LENGTH, a.NULLABLE FROM USER_TAB_COLUMNS a, USER_COL_COMMENTS b, USER_TAB_COMMENTS c, USER_TABLES d where 1=1 and a.TABLE_NAME = D.TABLE_NAME and a.TABLE_NAME=b.TABLE_NAME and b.TABLE_NAME=c.TABLE_NAME and a.COLUMN_NAME=b.COLUMN_NAME and a.TABLE_NAME ='BOARD' //여기에 테이블명 order by a.TABLE_NAME, a.COLUMN_ID
더보기
[ORACLE] NULL 함수 .NVL(),NVL2(), NULLIF()
NVL(NULL,대체값) // AVG가 NULL일경우 0으로 대체 SELECT NVL(AVG,0) FROM MEMBER; SELECT TRUNC(NVL(AGE,0)/10)*10 FROM MEMBER; NVL2(입력값, NOT NULL, 대체값, NULL 대체값) SELECT NVL2(AGE,TRUNC(AGE/10)*10,0) FROM DUAL; 두값이 같은 경우 NULL, 그렇지 않으면 첫번째 값 반환 NULLIF(값1,값2) SELECT NULLIF(AGE,19) FROM MEMBER; 조건에 따른 값 선택하기 DECODE(기준값,비교값,출력값,비교값,출력값) SELECT DECODE(GENDER,'남성',1,2) FROM MEMBER; SELECT DECODE(SUBSTR(PHONE,1,3)'011'..
더보기
