How to use SELECT statement to extract KNA1-NAME1 and KNB1-ZSABE

Question

In building table I_KNA1 in  form f_extract_data, an additional select statement is needed to select and  append datafrom (KNA1 and KNB1) to existing I_KNA1
In form f_extract_data table i_kna1 is populated with data from zd_kna101.(where ZD_KNA101 is a view of KNA1, KNB1 and KNBK.  It's a joint of these three tables.)  This will take care of all customers with KNBK-BANKL and KNBK-BANLN populated.  But this does not include new customers created in SAP CRM (no KNBK records).  Therefore a separate SELECT statement is needed to extract KNA1-NAME1 and KNB1-ZSABE for customers created in SAP CRM(the customers who do do not have BANKL and BANKN). These selected records are then need to be appended to I_KNA1.  It's possible that new selection statement might extract records that are already in existing I_KNA1 table.  IF this is the case, right after the append, sort I_KNA1 and remove duplicate records.
form f_extract_data.
select kunnr                         " Customer Number
         name1                         " Name
         zsabe                         " Business Unit
         bankl                         " Legacy Bank Key
         bankn                         " Legacy Bank Account
    from zd_kna101                     " View of KNA1, KNB1, and KNBK
    into table i_kna1
    for all entries in i_doc_by_ref
   where kunnr = i_doc_by_ref-kunnr
    and zsabe in s_zsabe.           
  if sy-subrc <> 0.
    message a116 with 'customer'.  " Customer Table is empty.  HALT!!!
  else.                                                    
    sort i_kna1 by kunnr.                                  
  endif.
will I have to use the join statement(for KNA1-NAME1 and KNB1-ZSABE using the key as KUNNR) here or give two seperate select statements for extracting data from KNA1 and KNB1 using the key as KUNNR.
THANKS FOR THE HELP.

Answer 1

I would suggest using the join on KUNNR.  Maybe something like this.
data: begin of itab occurs 0,
      kunnr type kna1-kunnr,
      name1 type kna1-name1,
      ZSABE type knb1-ZSABE,
      end of itab.
    select kna1~kunnr kna1~name1 knb1~zsabe
           into table itab
                from kna1
                   inner join knb1
                        on kna1~kunnr = knb1~kunnr
                               where ........
Regards,
Rich Heilman