Processing in 2 internal tables -Performance wise better option

Question

Hi Experts,
I have 2 internal tables.
ITAB1 and ITAB2  both are sorted by PSPHI.
ITAB1 has PSPHI  some more fields INVOICE DATE  and AMT
ITAB2 has PSPHI  some more fields amount.
Both itab1 and itab2 will always have same amount of data.
I need to filter data from ITAB2 based invoice date given on selection screen.since ITAB2 doesnt have invoice date field.
i am doing further processing to filter the records.
I have thought of below processing logic and wanted to know if there is a better option performance wise?
loop at ITAB1 into wa where invoice_date > selection screen date. (table which has invoice date)
lv_index = sy-tabix.
read table itab2 where psphi = wa-psphi and index = lv_index.
if sy-subrc = 0.
delete itab2 index lv_index.
endif.
endloop.

Answer 1

Hi Madhu,
My Requirement is as below could you please advice on this ?
ITAB1
Field   1 PSPHI ,    FIELD 2 INVOICE,  FIELD 3 INVOICE_DATE , FIELD4 AMT
             15245,                       INV1,                           02/2011  ,  400
              15245                       INV2                            02/2012  ,  430
ITAB2
   Field   1 PSPHI ,    FIELD 2 PSNR,      FIELD 3 MATNR  , FIELD4 AMT
             15245,                       PSNR1,                   X .          430
              15245                       IPSNR2                    Y,          400
When user enteres date on sel screen as 02/2011
I want to delete the data from itab1 and itab2 for invoice date greater then 02/2011/
If i delere ITAB1 for date > selection screen date.
Loop itab1.
delete itab2 where psphi in itab1 will delete both rows in above example because the field psphi which is common can be mutiple.
endloop.
Can you advice ?