Select Statement issue

Question

HI All,
    I have 10 records in a internal table. I have 20 records in a database table. i want those records from the database table which does not exists in internal table.Which is the better select statement for this situation with performance.
Regards,
Hazam

Answer 1

simplest way is just fetch all the records instead of checking each and every record of internal table with database table records.
select f1 f2 f3
       from mara
<b>       into table itab</b>
       where <condition>.
this will just replace all the existing records of ITAB with the new values.
here alternatively you can use <b>RANGES</b>. but if your primaarey key of that database table is only 1 field,then you can use RANGES. but if your WHERE condition fields also more,then this way of doing with RANGES is time consuming.
For example, if you are fetching data from MARA table,
RANGES R_MATNR FOR MARA-MATNR.
R_MATNR-SIGN = 'E'.
R_MATNR-OPTION = 'EQ'.
LOOP AT ITAB1.
  R_MATNR-LOW = ITAB1-MATNR.
  APPEND R_MATNR.
ENDLOOP.
Now R_MATNR will have all material nos fromn the first internal table.
then send this to select
SELECT * FROM MARA
<b>         APPENDING TABLE ITAB1</b>
         WHERE MATNR NOT IN R_MATNR.
Regards,
Srikanth
Message was edited by: Srikanth Kidambi
Message was edited by: Srikanth Kidambi