How to insert or update comparing values with two or more table

Question

Hai All
I have three or four table in my database.
Table 1 Dailattend is the main table here i need to insert or update my data and the fieds are
Emplcode number,attdate date, intime date,intrin date ,introut date, outtime date are the fields
Table 2 acclempbarcode the fields are
emplcode number ,barcode number ....etc
so now my data is in text format and i have broke the date like this
0011221100112200100320100815
First 16 is barcode and next 8 is date and 4 is time and i have created a temp table and store the date and move to main table
My problem is the main table dailattend has no barcode so when i am going to insert or update i need to check whether the barcode is match with the emplcode in the main table
How can i write insert or update statement
The data is like this
00110022 is barcode,10-03-2010 is my date and 0815 is time so i need to insert into dailattend table so now i have emplcode in dailattend table so i need to compare the barcode belong the emplcode in the another table and i need to insert in the dailattend table
Pls give me some solution with example
Regards
Srikkanth.M

Answer 1

try somthing like this
create table t1
as
select '0011221100112200' barcode,to_date('100320100815','ddmmyyyyhh24mi') dt
from dual
  create table barcodetbl
  emplcode varchar2(2000)
  barcode varchar2(2000)
  datetime date
merge into barcodetbl bc
using( select  * from  t1) x
on
(bc.barcode = x.barcode)
when matched
then update
set datetime = x.dt
when not matched
then
insert (emplcode,barcode,datetime)
values(1,x.barcode,x.dt)
/didn't realize that barcode is not in the main table.
something along the lines
Table 1 Dailattend is the main table here i need to insert or update my data and the fieds are
Emplcode number,attdate date, intime date,intrin date ,introut date, outtime date are the fields
Table 2 acclempbarcode the fields are
emplcode number ,barcode number ....etc
merge into dailattend bc
using( select  * from  t1, acclempbarcode ac where t1.barcode = ac.barcode) x
on
(bc.emplcode = x.emplcode)
when matched
then update
set datetime = x.dt
when not matched
then
insert (emplcode,datetime)
values(1,x.dt)
/Alvinder
Edited by: alvinder on Mar 23, 2010 3:50 PM