Make this query into for all entries

Question

Hello Experts,
please change this query into for all entries to increase performance
loop at itab1.
    SELECT  single b~vtext INTO itab2
     FROM vbkd AS a
        INNER JOIN tvkggt AS b
        ON akdkg1 = bkdkgr
     WHERE a~vbeln EQ itab1-vbeln_vauf
     AND a~posnr EQ itab1-posnr_vauf.
endloop.
Thank you so much for all the replies.

Answer 1

as I write again and again, then performance is mainly increased but correct index usage
SELECT single b~vtext
INTO itab2
FROM vbkd AS a
INNER JOIN tvkggt AS b
ON   ..... spras ???
       bkdkgr  = akdkg1 
WHERE a~vbeln EQ itab1-vbeln_vauf
AND      a~posnr EQ itab1-posnr_vauf.
You access vbkd with the primary key vbeln and posnr
and then you switch to tvkggt where you need spras and kdgr for the primary key
With spras you statement is incorrect you get one text it is unclear in which language,
it might be that there is onyl one, but still you *** it to the statement to use the index.
spras = sy-langu might be o.k.
I.e.
IF NOT ( itab1 is initial ).
   SELECT single b~vtext
       INTO itab2 
       FROM vbkd AS a
       INNER JOIN tvkggt AS b
       ON   b~spras = sy_langu
              b~kdkgr  = a~kdkg1
       FOR ALL ENTRIES in itab1  
       WHERE a~vbeln EQ itab1-vbeln_vauf
       AND      a~posnr EQ itab1-posnr_vauf.
ENDIF.
Siegfried