Update db table for duplicate entries.

Question

Hi,
If i want to update a ztable
i have 3 to 5 different ways.
1.   UPDATE ztab FROM workarea.
2.   UPDATE ztable SET field1 = wa-f1 field2  = wa-f2
               WHERE keyf1 = wa-kf1
               AND   keyf2 = wa-kf2.
3.  UPDATE ztable FROM TABLE itab.
4.  MODIFY ztable FROM TABLE itable  or from  wa.
but if i want to update some 2 to 3 fields
by checking with the fields in db table with values in flat file
and when i check the dbtable values with flat file and i find the entries in dbtable are multiple because i am not putting all key fields in where condition
because i know only some of them .
so duplicate entries are available and i wanted to update the same values to all those duplicate records .
then how should i update them.
i don't want to use update between
select and end-select because the records that i am updating are many.
i will store records into itab and then i will compare with values i file
and for all records i want to update the two or three fields with the values  in flat file.
help me.

Answer 1

Hi Ashish,
Thanks for your help.
If i do this way always it satisfies the first record of the multiple records that are satisfied when we put where condition with some of the key fields.
then always it might update the same record.
I stead i can loop through the itab having the DB table and read the file.
Anyways thanks for the help.
and i am waiting for the correct file, once i get it, then i will try this and update points.
Thanks,
Neetu.