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create or replace function FUN_GET_WORKTIME(PARAM_DATE IN DATE) return NUMBER
is
num_worktime number:= 8;--工作总时长
num_mi number:= 60;--60分钟
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;--时间
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
  --查询节假日表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);
  --判断当天是否为节假日
  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');
    --时间在8:30以前至0
    if(num_time<=num_work_begin) then
      num_return := num_return + 0;
    end if;
    --时间在8:30到11:30之间
    if(num_time > num_work_begin and num_time < num_noon_begin) then
      num_return := num_return + (num_time - num_work_begin);
    end if;
    --时间在11:30到12:00之间  
    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;
    --时间在12:00到17:00之间
    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;  
    --时间大于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;