My coding execution is slow due to Group function

Question

Hai All
I have genetating an attendace function by day today process
My coding is
declare
bar_code varchar2(25);
in_time varchar2(25);
out_time varchar2(25);
Cursor c1 is
Select BARCODE,BARDATE,BARTIME
From temp_attendance
group by barcode,bardate,bartime
ORDER BY BARCODE,bartime;
begin
for r1 in c1 loop
declare
bar_code varchar2(25);
begin
select barcode into bar_code from dail_att where barcode=r1.barcode and attend_date=r1.bardate;
For r in (select empcode,empname,barcode,intime,intrin,introut,addin,addout,outtime,attend_date from dail_att)loop
if r1.bartime between 1630 and 1830 and r.intime between 0715 and 0915 then
-- update dail_att set outtime=(select max(bartime) from temp_attendance group by barcode,bardate
-- having temp_attendance.barcode=dail_att.barcode and temp_attendance.bardate= dail_att.attend_date );
update dail_att set outtime=r1.bartime where barcode=r1.barcode and attend_date=r1.bardate and intime is not null;
elsif r1.bartime between 1930 and 2130 and r.intime between 1145 and 1245 then
     update dail_att set outtime=r1.bartime where barcode=r1.barcode and attend_date=r1.bardate and intime is not null;
--update dail_att set outtime=(select max(bartime) from temp_attendance  group by barcode,bardate
          -- having temp_attendance.barcode=dail_att.barcode and temp_attendance.bardate= dail_att.attend_date );
elsif r.intrin is null and r.intime is not null then
     update dail_att set intrin=r1.bartime where barcode=r1.barcode and attend_date=r1.bardate and
     intime is not null and introut is null and addin is null and addout is null;
elsif r.introut is null and r.intime is not null and r.intrin is not null then
     update dail_att set introut=r1.bartime where barcode=r1.barcode and attend_date=r1.bardate and intime is not null and intrin is not null and addin is null and addout is null;
     end if;     
end loop;
     exception
     when no_data_found then
     if r1.bartime between 0715 and 0915 or r1.bartime between 1145 and 1245 or r1.bartime between 1700 and 1800 then
          insert into dail_att(barcode,intime,attend_date)
          (select r1.barcode,min(r1.bartime),r1.bardate from temp_attendance group by r1.barcode,r1.bardate);
     elsif r1.bartime between 0100 and 0630 then
          update dail_att set outtime=r1.bartime where barcode=r1.barcode and attend_date=r1.bardate-1;
     end if;
     end;
end loop;
commit;
end;
when i to generate 700 records without Max function i working and takes time.But when i use MAX Function its not working and taking a lot of time why
Pls tell me some solution to rectify these problem
While using Max function with sample data it works fine..
Thanks & Regards
Srikkanth.M

Answer 1

Hello Sir
Thanks for your reply
As of now i have completed first part and in that little bit problems..
First step Fetch the records as text file and stores into table T1
and the next step is i have seperated the text using substring and stores in different columns of a table
There are two shifts 0815 to 1645 and 1200 and 2000
Here I rep IN and O rep OUT
Empno date time inout
001 01-01-10 0815 I
002 01-01-10 0815 I
003 01-01-10 0818 I
001 01-01-10 1100 0
001 01-01-10 1130 I
002 01-01-10 1145 0
002 01-01-10 1215 I
004 01-01-10 1200 I
005 01-01-10 1215 I
004 01-01-10 1315 O
004 01-01-10 1345 I
001 01-01-10 1645 0
002 01-01-10 1715 0
003 01-01-10 1718 0
004 01-01-10 2010 0
005 01-01-10 2015 0
This is my T1 table i have taken data from text file and stored in this table from this table i need to move data to another table T2
T2 contains like this
Empno Intime Intrin Introut Outtime Date
001 0815 1100 1130 1645 01-01-10
002 0815 1145 1215 1715 01-01-10
003 0818 1718 01-01-10
004 1200 1315 1345 2010 01-01-10
005 1215 2015 01-01-10
This what i am trying to do man but i have little bit problems Pls give some solution with good example
Thanks & Regards
Srikkanth.M