网站地图
【www.gdgbn.com--时间日期】
上月末的日期：select last_day(add_months(sysdate, -1)) from dual;
本月的最后一秒：select trunc(add_months(sysdate,1),"mm") - 1/24/60/60 from dual
本周星期一的日期：select trunc(sysdate,"day")+1 from dual
年初至今的天数：select ceil(sysdate - trunc(sysdate, "year")) from dual;
今天是今年的第几周 :select to_char(sysdate,"fmww") from dual
今天是本月的第几周:select to_char(sysdate,"ww") - to_char(trunc(sysdate,"mm"),"ww") + 1 as "weekofmon" from dual
本月的天数
select to_char(last_day(sysdate),"dd") days from dual
今年的天数
select add_months(trunc(sysdate,"year"), 12) - trunc(sysdate,"year") from dual
下个星期一的日期
select next_day(sysdate,"monday") from dual
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--计算工作日方法
create table t(s date,e date);
alter session set nls_date_format = "yyyy-mm-dd";
insert into t values("2003-03-01","2003-03-03");
insert into t values("2003-03-02","2003-03-03");
insert into t values("2003-03-07","2003-03-08");
insert into t values("2003-03-07","2003-03-09");
insert into t values("2003-03-05","2003-03-07");
insert into t values("2003-02-01","2003-03-31");
-- 这里假定日期都是不带时间的，否则在所有日期前加trunc即可。
select s,e,e-s+1 total_days,
trunc((e-s+1)/7)*5 + length(replace(substr("01111100111110",to_char(s,"d"),mod(e-s+1,7)),"0","")) work_days
from t;
-- drop table t;
================================================================================
判断当前时间是上午下午还是晚上
select case
when to_number(to_char(sysdate,"hh24")) between 6 and 11 then "上午"
when to_number(to_char(sysdate,"hh24")) between 11 and 17 then "下午"
when to_number(to_char(sysdate,"hh24")) between 17 and 21 then "晚上"
end
from dual;