select months_between(sysdate,to_date('2002-12-22','yyyy-mm-
dd'))
-- months_between(A,B) = A-B/30
--select add_months(sysdate,4) -- 특정일의 달수 더한 날
--select next_day(sysdate,'friday') -- 특정일의 다음주 요일
--select last_day(sysdate) -- 특정일의 해당 월의 마지막 날
--select round(sysdate,'dd') -- 특정일의 반올림(오후면 다음날..)
--select trunc(sysdate,'ww') -- 특정일의 주 첫일 찾기
from dual
# 날짜계산
/* 어제 */ 날짜칼럼 BETWEEN TRUNC(SYSDATE-1) AND TRUNC(SYSDATE-1)+0.99999421
/* 오늘 */ 날짜칼럼 BETWEEN TRUNC(SYSDATE) AND TRUNC(SYSDATE) + 0.99999421
/* 내일 */ 날짜칼럼 BETWEEN TRUNC(SYSDATE+1) AND TRUNC(SYSDATE+1)+0.99999421
/* 금주 */ 날짜칼럼 BETWEEN TRUNC(SYSDATE+1)-TO_CHAR(SYSDATE,'D')
AND TRUNC(SYSDATE+1)-TO_CHAR(SYSDATE,'D')+6.99999421
/* 차주 */ 날짜칼럼 BETWEEN TRUNC(SYSDATE+8)-TO_CHAR(SYSDATE, 'D')
AND TRUNC(TRUNC(SYSDATE)+14.99999421)-TO_CHAR(SYSDATE, 'D')
/* 금월 */ 날짜칼럼 BETWEEN TRUNC(SYSDATE+1)-TO_CHAR(SYSDATE,'DD')
AND TRUNC(LAST_DAY(SYSDATE))+0.99999421
/* 전월 */ 날짜칼럼 BETWEEN TRUNC(ADD_MONTHS(SYSDATE,-1)+1)-TO_CHAR(SYSDATE,'DD')
AND TRUNC(LAST_DAY(ADD_MONTHS(SYSDATE, -1)))+0.99999421
/* 차월 */ 날짜칼럼 BETWEEN ADD_MONTHS(TRUNC(SYSDATE),1)-TO_CHAR(SYSDATE,'DD')+1
AND LAST_DAY(ADD_MONTHS(TRUNC(SYSDATE),1)+0.99999421)
# 특정일 까지의 간격을 년, 개월, 일로 표현하기
SELECT
TRUNC(MONTHS_BETWEEN(SYSDATE, TO_DATE('19970101', 'YYYYMMDD'))/12) "년",
TRUNC(MONTHS_BETWEEN(SYSDATE, TO_DATE('19970101', 'YYYYMMDD')) -
TRUNC(MONTHS_BETWEEN(SYSDATE, TO_DATE('19970101', 'YYYYMMDD'))/12) * 12) "개월",
TRUNC((MONTHS_BETWEEN(SYSDATE,TO_DATE('19970101', 'YYYYMMDD')) -
TRUNC(MONTHS_BETWEEN(SYSDATE, TO_DATE('19970101', 'YYYYMMDD')))) * 30.5) "일"
FROM DUAL;
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