Logical Issue

Hi,

     I am having issue with following query-

LOOP AT IT_MKPF INTO WA_MKPF.

        SELECT PERNR

               USRID

          FROM PA0105

          INTO TABLE IT_PA0105

        WHERE USRID = WA_MKPF-USNAM.

      ENDLOOP.

That the loop is hitting the same select query more than 1000 times, I know that we should not write select query inside the 'LOOP' I have to pass  USNAM field into USRID field as they both are from different table and nothing having comman between them.

Please suggest me new query.

Thanks Regards.