Selecting data from data base tables into itab with multiple select queries

Question

Hi all,
       i am dealing with a situation where in there is 3 DB tables in all say
          1. ITAB - ZTBL_MAIN.
          2. DB table - ZTBL_SUB1.
          3. DB table - ZTBL_SUB2.
ZTBL_MAIN contains feilds from both tables 2 and 3 so to choose some records from ZTBL_SUB1 into the ITAB a select query has been written as below.
SELECT * FROM ZTBL_SUB1 INTO CORRESPONDING FIELDS OF TABLE ZTBL_MAIN
    WHERE <condition>.
now i also want some feilds in main for each record to be filled from the other DB table for which if i use another select query after the above one in my report prog. say..
SELECT * FROM ZTBL_SUB2 INTO CORRESPONDING FIELDS OF TABLE ZTBL_MAIN
    WHERE <condition>.
then all the previous records are going to be erased..Kindly let me know a way in which i can implement the above implementation.
Thanks&Rgds,
Naveen M

Answer 1

hi,
    Ur suggestions solved the syntax error. However my intial problem was not solved i.e., using the statement
SELECT * FROM ztbl_sub2 APPENDING CORRESPONDING FIELDS OF TABLE ztbl_main FOR ALL ENTRIES IN ztbl_main
     WHERE <field1> =  ztbl_main-<field1>.
creates or appends some more entries into the itab thats all.. But that is not what i am trying to implement.
As explained before the first select query would have filled certain fields for all records in ztbl_main from ztbl_sub1.
Now in the second select query i want to fill other fields of ztbl_main for all the records already fetched using first select query by using my where condition.
The above select query that was suggested only creates new records in the table ztab_main but does not fill the fields of the records as i expected.
how do i fullfil my requirment..
kindly help.
thnks & Rgds,
Naveen M