Help to work with 2 internal table with tricky use

Question

HI ,
I have 2 internal table one with new data and one with old data (same structure ) and i want to combine the 2 of them to final table .
what i need to do here is little bit tricky
The  table is build like this :
mandt
User
user_data
valid
if there is no different from the user data from table old to table new the user data in the final table should look like this
000
user1
userdata1
X
000
user1
userdata2
X
IF there is difference between of them the table entries in final table should like this
000
user1
userdata3
X
000
user1
userdata4
X
000
user1
userdata1
"Valid field is empty -abap false  since the user dont have this data (userdata1) any more
000
user1
userdata2
"Valid field is empty -abap false  since the user dont have this data (userdata2) any more
1. alwayes table new is coming with data that is valid field = abap_true
   and should be change the user entries just if there is new entries are diffrent than the old one .
2. table new can have new users with data so it enter the new users to final table with valid entry = abap_true
3. if in the new table there is no user which exist in the old table the user in the final table
should stay with the same entries but the valid entry should be abap false
What is the best way to do that ?
Regards
Chris
Edited by: Chris Teb on Nov 15, 2009 10:39 AM

Answer 1

HI
I have table with entries like that that i read from DB (i call it itab_old)
old_itab
mandt     User      user data      timestemp      valid
0     usr1      User_data1     X     TRUE
0     usr1      User_data2     X     TRUE
0     usr1      User_data3     X     TRUE
0     usr2      User_data1     X     TRUE
0     usr2      User_data2     X     TRUE
0     usr2      User_data3     X     TRUE
0     usr2      User_data4     X     TRUE
0     usr3     User_data1     X     TRUE
0     usr3     User_data2     X     TRUE
0     usr3     User_data3     X     TRUE
assume the user entry for usr 1 is changing i.e. (new entries in table itab_new) the table should look like this
new_itab
mandt     User      user data      timestemp      valid
0     usr1      User_data4     Y     TRUE
0     usr1      User_data2     Y     TRUE
0     usr1      User_data6     Y     TRUE
0     usr2      User_data1     Y     TRUE
0     usr2      User_data2     Y     TRUE
0     usr2      User_data3     Y     TRUE
0     usr2      User_data4     Y     TRUE
and the final_itab should look like that
usr1 old entries are mark as false and new recoreds is enter to the table for him ,
usr2 have the same entries so it not change
final_itab
mandt     User      user data      timestemp      valid
0     usr1      User_data1     X     FALSE
0     usr1      User_data2     X     FALSE
0     usr1      User_data3     X     FALSE
0     usr2      User_data1     X     TRUE
0     usr2      User_data2     X     TRUE
0     usr2      User_data3     X     TRUE
0     usr2      User_data4     X     TRUE
0     usr3     User_data1     X     TRUE
0     usr3     User_data2     X     TRUE
0     usr3     User_data3     X     TRUE
0     usr1      User_data4     Y     TRUE
0     usr1      User_data2     Y     TRUE
0     usr1      User_data6     Y     TRUE
0     usr7     User_data1     X     TRUE
0     usr7     User_data2     X     TRUE
0     usr7     User_data3     X     TRUE
last thing there is option that new user will come in table new_itab that is not exist in old table for this user we need to create new entry in final table (like user 7 )
Thanks in advance
Chris
Edited by: Chris Teb on Nov 15, 2009 10:50 PM