create or replace function FUN_GET_WORKTIME(PARAM_DATE IN DATE) return NUMBER
is
num_worktime number:= 8;--工作總時長
num_mi number:= 60;--60分鐘
num_ss number:= 60;--60秒
num_work_begin number:= 8/24 + 30/(24*60);--8:30
num_noon_begin number:= 11/24 + 30/(24*60);--11:30
num_noon_end number:= 12/24;--12:00
num_work_end number:= 17/24;--17:00
num_time number;--時間
num_return number;--返回值
d_init date := to_date('1988-08-08 00:00:00','YYYY-MM-DD hh24:mi:ss'); --初始日期
num_holi NUMBER;
num_holi_y NUMBER;
BEGIN
 --查詢節(jié)假日表holiday
 select count(1) into num_holi from holiday h where h.holi_day < to_char(PARAM_DATE, 'YYYY-MM-DD');
 select count(1) into num_holi_y from holiday h where h.holi_day = to_char(PARAM_DATE, 'YYYY-MM-DD');
 num_return := floor(PARAM_DATE - d_init - num_holi);
 --判斷當天是否為節(jié)假日
 if(num_holi_y >= 1) then
 num_return := num_return + 0;
 else
 num_time := PARAM_DATE - to_date(to_char(PARAM_DATE,'YYYY-MM-DD')||' 00:00:00','YYYY-MM-DD hh24:mi:ss');
 --時間在8:30以前至0
 if(num_time<=num_work_begin) then
 num_return := num_return + 0;
 end if;
 --時間在8:30到11:30之間
 if(num_time > num_work_begin and num_time < num_noon_begin) then
 num_return := num_return + (num_time - num_work_begin);
 end if;
 --時間在11:30到12:00之間 
 if(num_time > num_noon_begin and num_time<=num_noon_end) then
 num_return := num_return + (num_noon_begin-num_work_begin);
 end if;
 --時間在12:00到17:00之間
 if(num_time > num_noon_end and num_time<=num_work_end) then
 num_return := num_return + (num_time - num_work_begin - (num_noon_end - num_noon_begin));
 end if; 
 --時間大于17:00
 if(num_time > num_work_end ) then
 num_return := num_return + (num_work_end - num_work_begin - (num_noon_end - num_noon_begin));
 end if; 
 
 
 end if;
 num_return := num_return * num_worktime * num_mi * num_ss;
return (num_return);
end FUN_GET_WORKTIME;