Delete internal table data with another internal table without loop

[former_member710665]

Hi,

We have data in one internal table IT_TAB1 and it has Entity, source system columns. Another internal table IT_TAB2 having source system column only.

How to delete the records in IT_TAB1 where source system not in IT_TAB2 without using LOOP?

Is is possible in advanced ABAP with different declarations ?

[former_member710665]

If the version if ABAP is one of the modern, you can try use operator FILTER with keyword EXCEPT

It is described in help

https://help.sap.com/doc/abapdocu_752_index_htm/7.52/en-us/abenconstructor_expr_filter_table.htm

Example could be like that (as a result in internal table lt_itab1 will be only lines that are NOT in lt_itab2)

    types: BEGIN OF ts_line1
              , src_sys TYPE sysysid
              , field1 TYPE char10
              , field2 TYPE char10
          , END OF ts_line1
          , tt_line1 TYPE STANDARD TABLE OF ts_line1
            with NON-UNIQUE SORTED KEY PR COMPONENTS src_sys
          .

    types: BEGIN OF ts_line2
              , src_sys TYPE sysysid
          , END OF ts_line2
          , tt_line2 TYPE STANDARD TABLE OF ts_line2
          .

    data lt_itab1 TYPE tt_line1.
    data lt_itab2 TYPE tt_line2.


    lt_itab1 = VALUE #(  ( src_sys = 'ONE' field1 = 'F11' field2 = 'F21' )
                                ( src_sys = 'TWO' field1 = 'F12' field2 = 'F22' )
                                ( src_sys = 'THREE' field1 = 'F13' field2 = 'F23' )
                                ( src_sys = 'FOUR' field1 = 'F14' field2 = 'F24' ) ).


    lt_itab2 = VALUE #( ( src_sys = 'TWO' ) ( src_sys = 'FOUR' ) ).

""" to delete records that are not in lt_itab2
data(lt_itab10) = FILTER #( lt_itab1 USING key pr IN lt_itab2  WHERE src_sys = src_sys ).


""" to save records that are not in lt_itab2
    data(lt_itab11) = FILTER #(
       lt_itab1 USING KEY pr EXCEPT IN lt_itab2
       where src_sys = src_sys
    ).
" lt_itab11  will store ONE / THREE but not TWO and FOUR

[Sandra_Rossi]

Yes, for instance

it_tab1 = FILTER #( it_tab1 IN it_tab2 WHERE tab1_srcsystem = tab2_srcsystem ).

it_tab2 must be sorted or hashed.

[OlegBash]

If the version if ABAP is one of the modern, you can try use operator FILTER with keyword EXCEPT

It is described in help

https://help.sap.com/doc/abapdocu_752_index_htm/7.52/en-us/abenconstructor_expr_filter_table.htm

Example could be like that (as a result in internal table lt_itab1 will be only lines that are NOT in lt_itab2)

    types: BEGIN OF ts_line1
              , src_sys TYPE sysysid
              , field1 TYPE char10
              , field2 TYPE char10
          , END OF ts_line1
          , tt_line1 TYPE STANDARD TABLE OF ts_line1
            with NON-UNIQUE SORTED KEY PR COMPONENTS src_sys
          .

    types: BEGIN OF ts_line2
              , src_sys TYPE sysysid
          , END OF ts_line2
          , tt_line2 TYPE STANDARD TABLE OF ts_line2
          .

    data lt_itab1 TYPE tt_line1.
    data lt_itab2 TYPE tt_line2.


    lt_itab1 = VALUE #(  ( src_sys = 'ONE' field1 = 'F11' field2 = 'F21' )
                                ( src_sys = 'TWO' field1 = 'F12' field2 = 'F22' )
                                ( src_sys = 'THREE' field1 = 'F13' field2 = 'F23' )
                                ( src_sys = 'FOUR' field1 = 'F14' field2 = 'F24' ) ).


    lt_itab2 = VALUE #( ( src_sys = 'TWO' ) ( src_sys = 'FOUR' ) ).

""" to delete records that are not in lt_itab2
data(lt_itab10) = FILTER #( lt_itab1 USING key pr IN lt_itab2  WHERE src_sys = src_sys ).


""" to save records that are not in lt_itab2
    data(lt_itab11) = FILTER #(
       lt_itab1 USING KEY pr EXCEPT IN lt_itab2
       where src_sys = src_sys
    ).
" lt_itab11  will store ONE / THREE but not TWO and FOUR

[former_member710665]

Thank you olegbash599 for your detailed explanation. I have tried the Sandra approach and it works. Can you explain me "withNON-UNIQUESORTEDKEY PR COMPONENTS src_sys" this logic and how it filtered at the end please. Also, help me to understand that how your approch is different from Sandra approach.

[OlegBash]

praveen_channa
The differences of the approaches are:
1) With keyword EXCEPT the system could filter the lines which is in the second table. So it is comparing not by equality but inequality.
In your question I do have noticed this phrase "delete the records in IT_TAB1 where source system not in IT_TAB2".
So Sandra's approach is more applicable in that case.

2) using ley allows you to avoid using sorted type for example. It is what I was intend to show (how we can use standard table with FILTER function).

Thank you for your valuable question