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    Internal Table Operations in SAP ABAP

    Internal table operations are most important for an ABAP developer, below are some of the most important internal table operations

    • APPEND
    • INSERT
    • SORT
    • DESCRIBE TABLE
    • READ TABLE WITH KEY
    • READ TABLE WITH INDEX
    • LOOP….ENDLOOP.
    • MODIFY
    • DELETE
    • DELETE ADJACENT DUPLICATES
    • CLEAR, REFRESH, FREE
    • APPEND LINES OF
    • INSERT LINES OF
    • MOVE
    • COLLECT

    Using APPEND in SAP ABAP

    APPEND statement is used to append or add a record from work area to internal table, the new record will be added at the end of the internal table.

    Syntax: APPEND < WA> TO < ITAB>
    DATA: IT_MARA TYPE TABLE OF MARA.
    DATA : WA_MARA TYPE MARA.
    WA_MARA-MATNR = '00001'.
    WA_MARA-MTART = 'FERT'.
    WA_MARA-MEINS = 'EA'.
    APPEND WA_MARA TO IT_MARA . "APPEND WORK AREA TO INTERNAL TABLE
    

    Using INSERT in SAP ABAP

    INSERT statement is used to insert or add a record from work area into internal table at the specified location

    Syntax: INSERT < WA> INTO < ITAB> INDEX < index>
    DATA: IT_MARA TYPE TABLE OF MARA.
    DATA: WA_MARA TYPE MARA.
    WA_MARA-MATNR = '00001'.
    WA_MARA-MTART = 'FERT'.
    WA_MARA-MEINS = 'EA'.
    INSERT WA_MARA INTO IT_MARA INDEX 2 . "The record will be inserted into internal table at 2nd position
    

    Using SORT in SAP ABAP

    SORT is used to sort a Internal table data in ascending order or descending order, by default it will sort the data in ascending order. In addition to this we can able to sort data based on specified fields.

    Syntax1: SORT < ITAB . "Default sorts data in ascending order
    Syntax2 : SORT < ITAB> DESCENDING . " Sort in descending order
    Syntax3 : SORT < ITAB> BY < FIELD1>< FIELD2...ASCENDING/DESCENDING ."It sorts data by specified fields < FIELD1>, < FIELD2>..
    

    Using DESCRIBE TABLE in SAP ABAP

    DESCRIBE TABLE is used to count the no of records in a internal table

    Syntax: DESCRIBE TABLE < ITAB> LINES < v_lines> ." Count the no. Of 
    record of an internal table, here v_lines store count 
    DATA : V_LINES TYPE I. "Type integer
    DESCRIBE TABLE IT_MARA LINES V_LINES ." Count the no. of record of a internal table
    Write: v_lines .
    

    Using READ TABLE WITH KEY in SAP ABAP

    READ TABLE WITH KEY .. BINARY SEARCH is used to read a single record from an internal table into work area specified by field name and field value .

    BINARY SEARCH is a search mechanism which is used to read a record from internal table into work area very fast, the functionality of binary search it divides the into parts and searches, for full details Binary Search mechanism in SAP ABAP.

    The internal table must be sorted in ascending order before using binary search.

    Syntax: READ TABLE < ITAB> INTO < WA> WITH KEY < FIELD1> = < FIELD1 VALUE>< FIELD1> = < FIELD1 VALUE>

    BINARY SEARCH.

    .” Read a record into work area where some field = some value

    READ TABLE IT_MARA INTO WA_MARA WITH KEY MATNR = ‘0001’ BINARY SEARCH . “Read a

    record into work area where MATNE is ‘0001’

    Using READ TABLE WITH INDEX in SAP ABAP

    READ TABLE WITH INDEX is used to read a single record from an internal table into work area specified by index.

    Syntax: READ TABLE < ITAB> INTO < WA> INDEX < index_no
    ." Read a record into work area using index ( position )
    READ TABLE IT_MARA INTO WA_MARA INDEX '2'. "Read a record into work area where 
    

    index is 2.

    Using LOOP....ENDLOOP. in SAP ABAP

    Loop...Endloop. is also used to read data from a internal table into work area, this is used to read multiple records serially one after one .

    Syntax1: LOOP AT < ITAB> INTO < WA> .
    
    ENDLOOP.
    
    Syntax2: LOOP AT < ITAB> INTO < WA> WHERE < FIELDS1> = 
    
    < VALUE> .
    
    ENDLOOP.
    
    Syntax3: LOOP AT < ITAB> INTO < WA> FROM < INDEX1> TO 
    
    < INDEX2>.
    
    ENDLOOP.
    
    

    Using MODIFY in SAP ABAP

    MODIFY is used to modify a single or multiple internal table records based on condition

    TRANSPORTING is a keyword which is used to specify a list of fields to be modified instead of all fields.

    Syntax1: MODIFY < ITAB> FROM < WA> INDEX < INDEX NO> TRANSPORTING < FIELD1>< FIELD2>

    Syntax1: MODIFY < ITAB> FROM < WA> TRANSPORTING < FIELD1>

    < FIELD2> WHERE < CONDITION>

    SY-TABIX is a key word which stores the index no of currently processed record.

    DATA: IT_MARA TYPE TABLE OF MARA.
    DATA: WA_MARA TYPE MARA.
    
    SELECT * FROM MARA INTO TABLE IT_MARA ." GET DATA INTO ITAB IT_MARA
    
    WA_MARA-MTART = 'FERT'; "ASSIGN A VALUE TO WORKAREA TO MODIFY INTERNAL TABLE
    
    MODIFY IT_MARA FROM WA_MARA INDEX SY-TABIX TRANSPORTING MTART. " NOW THE VALUE OF 
    
    FIELD MTART WILL BE MODIFIED FOR CURRENT RECORD IN IT_MARA 
    
    DATA: IT_MARA TYPE TABLE OF MARA.
    DATA: WA_MARA TYPE MARA.
    
    SELECT * FROM MARA INTO TABLE IT_MARA. " GET DATA INTO ITAB IT_MARA
    
    WA_MARA-MTART = 'FERT'; "ASSIGN A VALUE TO WORKAREA TO MODIFY INTERNAL TABLE
    
    MODIFY IT_MARA FROM WA_MARA TRANSPORTING MTART WHERE MATNR = '0001'. " NOW THE 
    
    VALUE OF FIELD MTART WILL BE MODIFIED WHERE MATNR = '0001' IN ITAB 
    

    Using DELETE in SAP ABAP

    DELETE is used to delete single or multiple records from an internal table from work area based on some condition.

    Syntax1: DELETE < ITAB> INDEX < INDEX NO>.
    
    Syntax2: DELETE < ITAB> WHERE < FIELD1> = < FIELD1 VALUE>
    
    < FIELD2> = < FIELD2 VALUE>.
    DELETE IT_MARA INDEX 3. "3rd RECORD WILL BE DELETED IN IT_MARA
    
    DELETE IT_MARA WHERE MTART = 'FERT'. "MATERIALS WITH MTART = 'FERT' WILL BE DELETED
    

    Using DELETE ADJACENT DUPLICATES in SAP ABAP

    DELETE ADJACENT DUPLICATES is used to delete delete duplicate records which are adjacent to each-other.

    Pre-requisite for this is the internal table must be sorted in ascending order

    Syntax1: DELETE ADJACENT DUPLICATED FROM  < ITAB> ."ADJACENT DUPLICATED WILL 
    
    BE DELETED IN INTERNAL TABLE COMPARING ALL FIELDS
    
    Syntax2: DELETE ADJACENT DUPLICATES FROM < ITAB> COMPARING < FIELD1>
    
    < FIELD2> . "ADJACENT DUPLICATES WILL BE DELETED COMPARING SPECIFIED FIELDS
    SORT IT_MARA ASCENDING.
    DELETE ADJACENT DUPLICATES FROM IT_MARA . "3rd RECORD WILL BE DELETED IN IT_MARA
    
    SORT IT_MARA ASCENDING.
    DELETE ADJACENT DUPLICATES IT_MARA COMPARING MATR, MTART. "DUPLICATES WILL BE 
    
    DELETED BY COMPARING MATNR AND MTART
    

    Using CLEAR, REFRESH, FREE in SAP ABAP

    CLEAR is used to clear a value in a work area or in a variable.

    REFRESH is used to clear all values in an internal table.

    FREE is used to clear (free) memory of an internal table or work area. We all know whenever we declare an internal table or work area, 8kb memory will be allocated.

    Syntax clear : CLEAR < WA> "CLEAR WORK AREA OR VARIABLE
    
    Syntax REFRESH: REFRESH < ITAB> "CLEAR ALL RECORDS OF INTERNAL TABLE BUT 
    
    MEMORY WILL BE THERE
    
    Syntax FREE : FREE < WA>  "FREE INTERNAL TABLE MEMORY
    CLEAR WA_MARA.
    
    REFRESH IT_MARA.
    
    FREE IT_MARA.
    

    Using APPEND LINES OF in SAP ABAP

    APPEND LINES OF is used to append multiple records to an internal table from another internal table.

    Syntax : APPEND LINES OF < ITAB1> FROM < index no> TO < index no2>
    
    TO < ITAB2>.
    
    DATA: IT_MARA TYPE TABLE OF MARA. "FIRST INTERNAL TABLE
    DATA: IT_MARA1 TYPE TABLE OF MARA. "SECOND INTERNAL TABLE
    
    APPEND LINES OF IT_MARA FROM 3 TO 5 TO IT_MARA1. "DATA IN IT_MARA WILL BE APPENDED 
    
    TO IT_MARA1 FROM INDEX 3 TO INDEX 5 .
    

    Using INSERT LINES OF in SAP ABAP

    INSERT LINES OF is used to INSERT multiple records to an internal table from another internal table at the specified location.

    Syntax : INSERT LINES OF < ITAB1> FROM < index no> TO < index no2>
    
    INTO < ITAB2> INDEX < index no>.
    
    DATA: IT_MARA TYPE TABLE OF MARA. "FIRST INTERNAL TABLE
    DATA : IT_MARA1 TYPE TABLE OF MARA. "SECOND INTERNAL TABLE
    
    INSERT LINES OF IT_MARA FROM 3 TO 5 INTO IT_MARA1 INDEX 3. "DATA IN IT_MARA WILL 
    
    BE INSERTED INTO IT_MARA1 FROM INDEX 3 TO INDEX 5 AT INDEX 3 LOCATION.
    

    Using MOVE in SAP ABAP

    MOVE keyword is used to move one internal table data to another.

    Syantax: < ITAB2[]> = []> . "Move ITAB1 to ITAB2

    Using COLLECT in SAP ABAP

    COLLECT is slimier to APPEND, the difference is it (COLLECT) will check whether the work area record already exists with the same key (only C, D, N, T), if exists it will add numerical fields (sum) to the existing record, if the work area record does not exist it will append a new record.

    Syntax: COLLECT < WA> INTO < ITAB>.


     

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