Read statement in internal table.

Question

PLease help me to figure out what a read statement does???
Please show me through examples how a read statements selects data from a table ,,,puts into internal table & finally we are able to read it through work area????
thanx... <REMOVED BY MODERATOR>
Edited by: Alvaro Tejada Galindo on Mar 10, 2008 7:27 PM

Answer 1

Hey saswat ,
   just wanted to give a simplified example of ur query , if not understood please ask
REPORT  Z_PRGM_TRY_READ NO STANDARD PAGE HEADING.
TABLES : MARA , MARD.
SELECT-OPTIONS : S_MATNR FOR MARA-MATNR.
TYPES : BEGIN OF LT_MARA ,
        MATNR LIKE MARA-MATNR ,
        ERSDA LIKE MARA-ERSDA ,
        MBRSH LIKE MARA-MBRSH ,
        END OF LT_MARA .
DATA : TT_MARA TYPE STANDARD TABLE OF LT_MARA INITIAL SIZE 0 ,
       WA_MARA TYPE LT_MARA .
TYPES : BEGIN OF LT_MARD ,
        MATNR LIKE MARD-MATNR ,
        WERKS LIKE MARD-WERKS ,
        LGORT LIKE MARD-LGORT ,
        PSTAT LIKE MARD-PSTAT ,
        END OF LT_MARD.
DATA : TT_MARD TYPE STANDARD TABLE OF LT_MARD INITIAL SIZE 0 ,
       WA_MARD TYPE LT_MARD.
TYPES : BEGIN OF LT_FINAL ,
        MATNR LIKE MARA-MATNR ,
        ERSDA LIKE MARA-ERSDA ,
        MBRSH LIKE MARA-MBRSH ,
        WERKS LIKE MARD-WERKS ,
        LGORT LIKE MARD-LGORT ,
        PSTAT LIKE MARD-PSTAT ,
        END OF LT_FINAL .
DATA : TT_FINAL TYPE STANDARD TABLE OF LT_FINAL INITIAL SIZE 0 ,
        WA_FINAL TYPE LT_FINAL .
SELECT MARA~MATNR
       ERSDA
       MBRSH
       INTO CORRESPONDING FIELDS OF TABLE TT_MARA FROM MARA WHERE  MARA~MATNR IN S_MATNR .
SELECT MARD~MATNR
       WERKS
       LGORT
       PSTAT
       INTO CORRESPONDING FIELDS OF TABLE TT_MARD FROM MARD
       FOR ALL ENTRIES IN TT_MARA
       WHERE MATNR = TT_MARA-MATNR.
LOOP AT TT_MARA INTO WA_MARA.
READ TABLE TT_MARD INTO WA_MARD WITH KEY MATNR  = WA_MARA-MATNR .
IF SY-SUBRC = 0.
WA_FINAL-MATNR = WA_MARA-MATNR .
WA_FINAL-ERSDA = WA_MARA-ERSDA.
WA_FINAL-MBRSH = WA_MARA-MBRSH.
WA_FINAL-WERKS = WA_MARD-WERKS.
WA_FINAL-LGORT = WA_MARD-LGORT.
WA_FINAL-PSTAT = WA_MARD-PSTAT.
APPEND WA_FINAL TO TT_FINAL.
CLEAR WA_FINAL.
ENDIF.
ENDLOOP.
LOOP AT TT_FINAL INTO WA_FINAL.
WRITE : / WA_FINAL-MATNR , WA_FINAL-ERSDA , WA_FINAL-MBRSH , WA_FINAL-WERKS ,
           WA_FINAL-LGORT , WA_FINAL-PSTAT.
ENDLOOP.