今年第一天 00:00:00
select trunc(sysdate, "yyyy") from dual;
去年最后一天 23:59:59
select trunc(sysdate,"year")-1+ 0.99999 from dual;
本季第一天 00:00:00
select trunc(sysdate, "Q") from dual;
本季最后一天 00:00:00
select add_months(trunc(sysdate, "Q"), 3)-1 from dual;
本季最后一天 23:59:59
select add_months(trunc(sysdate, "Q"), 3)-0.00001 from dual;
上个月最后一天 23:59:59
select trunc(last_day(add_months(sysdate,-1)))+ 0.99999 from dual;
上个月最后一天 23:45:00
select trunc(last_day(add_months(sysdate,-1)))+ 0.98958 from dual;
上个月第一天 00:00:00
select trunc(add_months(last_day(sysdate), -2) + 1)from dual;
上上个月最后一天 23:59:59
select trunc(last_day(add_months(sysdate,-2)))+ 0.99999 from dual;
本月第一天 00:00:00
select trunc(add_months(last_day(sysdate), -1) + 1)from dual;
select trunc(sysdate, "mm") from dual;
本周第一天 00:00:00
select trunc(sysdate, "d") + 1 from dual;
本周最后一天 00:00:00
select trunc(sysdate, "d") + 7 from dual;
此时此刻
select SYSDATE from dual;
今天 00:00:00
select TRUNC(SYSDATE) from dual;
昨天 00:00:00
select TRUNC(SYSDATE - 1) from dual;
昨天23:59:59
select TRUNC(SYSDATE - 1)+0.99999 from dual;
前天 00:00:00
select TRUNC(SYSDATE - 2) from dual;
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