oracle 日期操作語句總結
阿新 • • 發佈:2020-08-11
1.查詢當前年、月、周相關時間
1.1.查詢當前年份
SELECT TO_CHAR(SYSDATE,'YYYY') AS YEAR FROM DUAL--查詢當前年份 SELECT TO_CHAR(SYSDATE,'YYY') AS YEAR FROM DUAL--查詢當前年份後兩位 SELECT TO_CHAR(SYSDATE,'YY') AS YEAR FROM DUAL--查詢當前年份最後兩位 SELECT TO_CHAR(SYSDATE,'Y') AS YEAR FROM DUAL--查詢當前年份最後一位
1.2.查詢當前年份第幾天
SELECT TO_CHAR(SYSDATE,'DDD') AS DAYS FROM DUAL
1.3.查詢當前月份第幾天
SELECT TO_CHAR(SYSDATE,'DD') AS DAYS FROM DUAL
1.4.查詢當前周的星期幾
SELECT TO_CHAR(SYSDATE,'dy') AS WEEK FROM DUAL SELECT TO_CHAR(SYSDATE,'day') AS WEEK FROM DUAL
2.查詢當前第幾季度
SELECT TO_CHAR(SYSDATE,'Q') AS JD FROM DUAL
3.查詢當前在一年內是第幾周
SELECT TO_CHAR(SYSDATE,'IW') AS WEEKNUM FROM DUAL SELECT TO_CHAR(SYSDATE,'WW') AS WEEKNUM FROM DUAL SELECT TO_CHAR(SYSDATE,'W') AS WEEKNUM FROM DUAL
4.查詢當前某年某月有多少天
SELECT TO_CHAR(last_day(to_date('2019/02/01','YYYY/MM/DD')),'DD') AS MONTH_DAYS_NUMBER FROM DUAL
5.查詢當前的日期格式
SELECT TO_CHAR(SYSDATE,'YYYY/MM/DD') AS MONTH FROM DUAL--獲取當前日期的'YYYY/MM/DD'格式:2020/01/02 SELECT TO_CHAR(SYSDATE,'YYYYMMDD') AS MONTH FROM DUAL--獲取當前日期的'YYYYMMDD'格式:20200102 SELECT TO_CHAR(SYSDATE,'YYYYMMDD HH:MI:SS') AS now FROM DUAL--獲取當前時間,精確到秒的12小時制格式:20200102 03:18:25 SELECT TO_CHAR(SYSDATE,'YYYYMMDD HH24:MI:SS') AS now FROM DUAL--獲取當前時間,精確到秒24小時制的格式:20200102 15:18:13 SELECT TO_CHAR(SYSDATE,'YYYY/MM/DD HH24:MI:SS:PM:DY') AS now FROM DUAL--獲取當前時間的格式,顯示上、下午和星期幾:2020/01/02 15:17:59:下午:星期四
6.查詢距離當前時間一段時間間隔的時間,當前時間之前用“-”當前時間之後用“+”
SELECT TO_CHAR(SYSDATE,'YYYY/MM/DD HH24:MI:SS') AS NOW,TO_CHAR(SYSDATE - INTERVAL '7' second,'YYYY/MM/DD HH24:MI:SS') AS PAST FROM DUAL --查詢當前時間的7秒前時間 SELECT TO_CHAR(SYSDATE,TO_CHAR(SYSDATE - INTERVAL '7' minute,'YYYY/MM/DD HH24:MI:SS') AS PAST FROM DUAL --查詢當前時間的7分鐘前時間 SELECT TO_CHAR(SYSDATE,TO_CHAR(SYSDATE - INTERVAL '7'hour,'YYYY/MM/DD HH24:MI:SS') AS PAST FROM DUAL --查詢當前時間的7小時前時間 SELECT TO_CHAR(SYSDATE,TO_CHAR(SYSDATE - INTERVAL '7'day,'YYYY/MM/DD HH24:MI:SS') AS PAST FROM DUAL --查詢當前時間的7天前時間 SELECT TO_CHAR(SYSDATE,TO_CHAR(SYSDATE - INTERVAL '7'month,'YYYY/MM/DD HH24:MI:SS') AS PAST FROM DUAL --查詢當前時間的7月前時間 SELECT TO_CHAR(SYSDATE,TO_CHAR(SYSDATE - INTERVAL '7'year,'YYYY/MM/DD HH24:MI:SS') AS PAST FROM DUAL --查詢當前時間的7年前時間 SELECT TO_CHAR(SYSDATE,TO_CHAR(SYSDATE - 8*INTERVAL '7'hour,'YYYY/MM/DD HH24:MI:SS') AS PAST FROM DUAL --查詢當前時間引數年、月、日、時、分、秒乘以一個數字倍數之前的時間
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