What are nested Internal tables

Hi Guru's,
I am new to ABAP ...just trying to learn things.Can you please explain me what are nested internal tables and what is the purpose of nested internal table?where can it be used and why a header line is not written in a Nested Internal table...
Kindly explain it (scenario where nested internal tables are used) with an example it will be helpful.
Cheers,
Priyanka

Hi,
When storing data in internal tables, you often use one internal table for each database you read.
Each one contains some or all columns of the relevant database table. It is up to you whether
you create an internal table with a flat structure for each database table or if you create, for
example, internal tables with nested structures. If you have several tables, each one with a flat
structure, you have to work with redundant key fields to link the tables. If, on the other hand, you
use nested internal tables, you can store the data from the database tables hierarchically.
Saving and processing very large amounts of data in internal tables has disadvantages. If you
divide up the data into different internal tables, processing it can be very runtime-intensive, since
the tables have to be processed individually. Furthermore, it requires a lot of storage space,
since internal tables are not stored in compressed form. The system may even need to store the
dataset outside of its working memory. This means that processing it takes even longer.
An example of nested internal table:
Assume the following program is linked to the logical database [Page 1163] F1S.
REPORT DEMO.
DATA: SUM TYPE I, CNT TYPE I.
NODES: SPFLI, SFLIGHT, SBOOK.
DATA: BEGIN OF WA_SBOOK,
BOOKID TYPE SBOOK-BOOKID,
SMOKER TYPE SBOOK-SMOKER,
CLASS TYPE SBOOK-CLASS,
LUGGWEIGHT TYPE SBOOK-LUGGWEIGHT,
WUNIT TYPE SBOOK-WUNIT,
END OF WA_SBOOK.
DATA: BEGIN OF WA_SFLIGHT,
FLDATE TYPE SFLIGHT-FLDATE,
SBOOK LIKE TABLE OF WA_SBOOK,
END OF WA_SFLIGHT.
DATA: BEGIN OF WA_SPFLI,
CARRID TYPE SPFLI-CARRID,
CONNID TYPE SPFLI-CONNID,
CITYFROM TYPE SPFLI-CITYFROM,
CITYTO TYPE SPFLI-CITYTO,
SFLIGHT LIKE TABLE OF WA_SFLIGHT,
END OF WA_SPFLI.
DATA TAB_SPFLI LIKE TABLE OF WA_SPFLI.
START-OF-SELECTION.
GET SPFLI.
REFRESH WA_SPFLI-SFLIGHT.
GET SFLIGHT.
REFRESH WA_SFLIGHT-SBOOK.
GET SBOOK.
MOVE-CORRESPONDING SBOOK TO WA_SBOOK.
APPEND WA_SBOOK TO WA_SFLIGHT-SBOOK.
GET SFLIGHT LATE.
MOVE-CORRESPONDING SFLIGHT TO WA_SFLIGHT.
APPEND WA_SFLIGHT TO WA_SPFLI-SFLIGHT.
GET SPFLI LATE.
MOVE-CORRESPONDING SPFLI TO WA_SPFLI.
APPEND WA_SPFLI TO TAB_SPFLI.
END-OF-SELECTION.
SORT TAB_SPFLI BY CITYFROM CITYTO CONNID.
LOOP AT TAB_SPFLI INTO WA_SPFLI.
SKIP.
WRITE: / WA_SPFLI-CARRID,
WA_SPFLI-CONNID,
'from', (15) WA_SPFLI-CITYFROM,
'to', (15) WA_SPFLI-CITYTO.
ULINE.
SORT WA_SPFLI-SFLIGHT BY FLDATE.
LOOP AT WA_SPFLI-SFLIGHT INTO WA_SFLIGHT.
SKIP.
WRITE: / 'Date:', WA_SFLIGHT-FLDATE.
WRITE: 20 'Book-ID', 40 'Smoker', 50 'Class'.
ULINE.
SORT WA_SFLIGHT-SBOOK BY CLASS SMOKER BOOKID.
SUM = 0.
CNT = 0.
LOOP AT WA_SFLIGHT-SBOOK INTO WA_SBOOK.
WRITE: / WA_SBOOK-BOOKID UNDER 'Book-ID',
WA_SBOOK-SMOKER UNDER 'Smoker',
WA_SBOOK-CLASS UNDER 'Class'.
SUM = SUM + WA_SBOOK-LUGGWEIGHT.
CNT = CNT + 1.
ENDLOOP.
ULINE.
WRITE: 'Number of bookings: ', (3) CNT,
/ 'Total luggage weight:',
(3) SUM, WA_SBOOK-WUNIT.
ENDLOOP.
ENDLOOP.
Thanks.

Similar Messages

What are dyanmic internal tables and what s the exact use of forall entries

what are dyanmic internal tables and what s the exact use of forall entries?

hi,
dynamic internal table.
http://searchsap.techtarget.com/tip/1,289483,sid21_gci912390,00.html
http://www.sap-img.com/ab030.htm

FOR ALL ENTRIES is an effective way of doing away with using JOIN on two tables.
You can check the below code -
SELECT BUKRS BELNR GJAHR AUGDT
FROM BSEG
INTO TABLE I_BSEG
WHERE BUKRS = ....
SELECT BUKRS BELNR BLART BLDAT
FROM BKPF
INTO TABLE I_BKPF
FOR ALL ENTRIES IN I_BSEG
WHERE BUKRS = I_BSEG-BUKRS
AND BELNR = I_BSEG-BELNR
AND BLDAT IN SO_BLDAT.
*******************************8
look another example
what is the use of FOR ALL ENTRIES
1. INNER JOIN
DBTAB1 <----
> DBTAB2
It is used to JOIN two DATABASE tables
having some COMMON fields.
2. Whereas
For All Entries,
DBTAB1 <----
> ITAB1
is not at all related to two DATABASE tables.
It is related to INTERNAL table.
3. If we want to fetch data
from some DBTABLE1
but we want to fetch
for only some records
which are contained in some internal table,
then we use for alll entries.
1. simple example of for all entries.
2. NOTE THAT
In for all entries,
it is NOT necessary to use TWO DBTABLES.
(as against JOIN)
3. use this program (just copy paste)
it will fetch data
from T001
FOR ONLY TWO COMPANIES (as mentioned in itab)
4
REPORT abc.
DATA : BEGIN OF itab OCCURS 0,
bukrs LIKE t001-bukrs,
END OF itab.
DATA : t001 LIKE TABLE OF t001 WITH HEADER LINE.
itab-bukrs = '1000'.
APPEND itab.
itab-bukrs = '1100'.
APPEND itab.
SELECT * FROM t001
INTO TABLE t001
FOR ALL ENTRIES IN itab
WHERE bukrs = itab-bukrs.
LOOP AT t001.
WRITE :/ t001-bukrs.
ENDLOOP.
Hope this helps!
Regards,
Anver

What are the internal table events

hi experts
can u help me for this

Hi ramesh,
There are basically internal table events are as below...
at first / endat
at last / endat
at new / endat
at end of / endat
sum
on change of / endon
Use the at first and at last statements to perform processing during the first or last loop pass of an internal table.
Use the at new and at end of statements to detect a change in a column from one loop pass to the next. These statements enable you to execute code at the beginning and end of a group of records.
Use the sum statement to calculate totals for the rows of a control level.
Another statement you can use to perform control break processing is on change of. It behaves in a manner similar to at new.
on change of differs from at new in the following respects:
It can be used in any loop construct, not just loop at. For example, it can be used within select and endselect, do and enddo, or while and endwhile, as well as inside get events.
A single on change of can be triggered by a change within one or more fields named after of and separated by or. These fields can be elementary fields or field strings. If you are within a loop, these fields do not have to belong to the loop.
When used within a loop, a change in a field to the left of the control level does not trigger a control break.
When used within a loop, fields to the right still contain their original values; they are not changed to contain zeros or asterisks.
You can use else between on change of and endon.
You can use it with loop at it where . . ..
You can use sum with on change of. It sums all numeric fields except the one(s) named after of.
Any values changed within on change of remain changed after endon. The contents of the header line are not restored as they are for at and endat.
Reward Points if it useful....
Thanks and Regards
Sreenivasa sharma k.

Nested Internal Table Tables and REUSE_ALV_GRID_DISPLAY

Can you display entries from a nested internal table in the using the call function 'REUSE_ALV_GRID_DISPLAY'?
Types and internal tables are below. I have skimmed the code for the function module below, assume field category built, etc.. The table is in the tables portion of the function module, the nested internal table is inside of int_output defined as data: int_tlines type t_tline occurs 0.
TYPES:
BEGIN OF t_tline,
tdformat type tline-tdformat,
tdline type tline-tdline,
END OF t_tline.
DATA:
BEGIN OF int_output occurs 0,
qmnum       TYPE qmnum,
sys_stat    TYPE j_stext,
kunum       TYPE qkunum,
sting       TYPE string,
numr        TYPE vbeln,
bstnk       TYPE bstkd,
vbeln       TYPE kdauf,
erdat(10)   TYPE c,
aufnr       TYPE aufnr,
werks       TYPE werks_d,
idat2(10)   TYPE c,
otgrp       TYPE otgrp,
oteil       TYPE oteil,
fd_text     TYPE qtxt_code,
fegrp       TYPE fegrp,
fecod       TYPE fecod,
pb_text     TYPE qtxt_code,
fetxt       TYPE fetxt.
data: int_tlines type t_tline occurs 0.
data: QMTXT TYPE QMEL-QMTXT,
NOTIF_TXT   TYPE STRING,
bautl       TYPE bautl,
bautx       TYPE bautx,
END OF int_output.
DATA: i_output      LIKE STANDARD TABLE OF int_output,
w_output      LIKE LINE OF int_output.
CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
    EXPORTING
    TABLES
      t_outtab                 = int_output
    EXCEPTIONS
      program_error            = 1
      OTHERS                   = 2.

Hi
I dont think this requirement is possible. Even if we pass the data through the nested internal table the FM may not give a dump. The main problem will be with field catalog. How can we build field catalog for the fields inside the nested internal table.
Field catalog for this FM REUSE_ALV_GRID_DISPLAY should be of type SLIS_FIELDCAT_ALV and this is a standard one.

What are hte pooled tables

Hello,
I dont know what are the pooled tables in ABAP. Please any one help me to know this question.
I will be thankfull to all,
By
satish

Hi,
Here i am giving the definitions and differences between
different table types in SAP.
It gives you clear idea.
You can also go thru. below link
http://web.mit.edu/ist/org/admincomputing/dev/sap_table_types.htm
I. Transparent tables (BKPF, VBAK, VBAP, KNA1, COEP)
Allows secondary indexes (SE11->Display Table->Indexes)
Can be buffered (SE11->Display Table->technical settings) Heavily updated tables should not be buffered.
II. Pool Tables (match codes, look up tables)
Should be accessed via primary key or
Should be buffered (SE11->Display Table->technical settings)
No secondary indexes
Select * is Ok because all columns retrieved anyway
III. Cluster Tables (BSEG,BSEC)
Should be accessed via primary key - very fast retrieval otherwise very slow
No secondary indexes
Select * is Ok because all columns retrieved anyway. Performing an operation on multiple rows is more efficient than single row operations. Therefore you still want to select into an internal table. If many rows are being selected into the internal table, you might still like to retrieve specific columns to cut down on the memory required.
Statistical SQL functions (SUM, AVG, MIN, MAX, etc) not supported
Can not be buffered
IV. Buffered Tables (includes both Transparent & Pool Tables)
While buffering database tables in program memory (SELECT into internal table) is generally a good idea for performance, it is not always necessary. Some tables are already buffered in memory. These are mostly configuration tables. If a table is already buffered, then a select statement against it is very fast. To determine if a table is buffered, choose the 'technical settings' soft button from the data dictionary display of a table (SE12). Pool tables should all be buffered
Hope this clears your doubt.
Note: Please reward the points for helpful answers.
Regards,
Gopinath Addepalli

How to create dynamic nested internal table

Hi Experts,
Pleae tell me or give sample code, how to create dynamic nested internal table ?
I have seen threads saying creation of dynamic internal tables using some table structure only. But now the requirement is to create dynamic nested internal table.
For example the internal table contains two fields viz., one is field1 of dynamic internal table and other is normal field2 and values as shown below:
Nested internal table:
field1 | field2 ...
<table content1> | value2..
<table content1> | value2..
Here the [table content] should also a dynamic internal table.
Let me know if you need any other info.
regards
Saravanan R

see the complete code..i am currently working in ECC6.0 EHP4. just check which version you are using..
REPORT yst_test_000.
DATA:
 lt_comptab TYPE cl_abap_structdescr=>component_table,
 ls_comp LIKE LINE OF lt_comptab,
 lref_newstr TYPE REF TO cl_abap_structdescr,
 lref_tab_type TYPE REF TO cl_abap_tabledescr,
 lt_fcat TYPE lvc_t_fcat,
 ls_fcat TYPE lvc_s_fcat,
 ls_dd03p TYPE dd03p,
 lt_data type ref to data.
field-symbols: <fs_table> type standard table.
CALL FUNCTION 'LVC_FIELDCATALOG_MERGE'
EXPORTING
 i_structure_name = 'SCARR'
CHANGING
 ct_fieldcat = lt_fcat
EXCEPTIONS
 inconsistent_interface = 1
 program_error = 2
 OTHERS = 3.
IF sy-subrc NE 0.
MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
 WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
ENDIF.
LOOP AT lt_fcat INTO ls_fcat.
IF ls_fcat-ref_table IS NOT INITIAL.
 CLEAR ls_dd03p.
 CALL FUNCTION 'BUS_DDFIELD_GET'
 EXPORTING
 i_tabnm = ls_fcat-ref_table
 i_fldnm = ls_fcat-fieldname
 IMPORTING
 e_dd03p = ls_dd03p
 EXCEPTIONS
 field_not_found = 1
 OTHERS = 2.
 IF sy-subrc EQ 0.
 ls_comp-name = ls_fcat-fieldname.
 ls_comp-type ?= cl_abap_datadescr=>describe_by_name( ls_dd03p-rollname ).
 APPEND ls_comp TO lt_comptab.
 CLEAR ls_comp.
 ENDIF.
ELSE.
 ls_comp-name = ls_fcat-fieldname.
 ls_comp-type ?= cl_abap_datadescr=>describe_by_name( ls_fcat-rollname ).
 APPEND ls_comp TO lt_comptab.
 CLEAR ls_comp.
ENDIF.
ENDLOOP.
*Now for the Field which you want deep table then you can do like this
ls_fcat-fieldname = 'NESTED_TABLE'.
ls_fcat-inttype = 'C'.
ls_fcat-intlen = '000006'.
ls_fcat-rollname = 'SFLIGHT_TAB1'. "For SFLIGHT
APPEND ls_fcat TO lt_fcat.
ls_comp-name = ls_fcat-fieldname.
ls_comp-type ?= cl_abap_datadescr=>describe_by_name( ls_fcat-rollname ).
APPEND ls_comp TO lt_comptab.
CLEAR ls_comp.
lref_newstr = cl_abap_structdescr=>create( lt_comptab ).
lref_tab_type = cl_abap_tabledescr=>create( lref_newstr ).
create data lt_data type handle lref_tab_type.
assign lt_data->* to <fs_table>.
break-point.
Edited by: Vijay Babu Dudla on Apr 28, 2009 8:05 AM

Difference between work area and internal tables.

Hi I wanna know the difference between work area and internal tables.
what happend if i give with out header line in internal table.
also how to assosiate work area to internal table in that scenario.

Hi Balaji..
The internal table is an ABAP runtime object which has two parts the Body and the header.
Whereas a work area cannot have a body.. It is mere a field or group of fields which can hold values at runtime..
In the SAP higher versions mySAP ERP, the use of tables with header line is made obsolete.. But there is absolutely no problem with the same..
Just think that when you define an internal table with occurs or with header line statement, the system automatically creates a workarea with this table, using which you can access the contents in the bosy of tyhe table.. You can read a record from the table body to this header or add a record in the header to the internal table body..
When you work with a table ITAB without a header line, you can not use statements like READ TABLE, APPEND, INSERT etc without giving an explicit work area..
Suppose i have an internal table like:
DATA : itab TYPE STANDARD TABLE OF t001.
This table will not have a header with it.
If you will use APPEND itab. The compilor will give error.
Here i will create a work area with same structure of the table.
DATA : e_wa TYPE t001.
Now i will write:
APPEND e_wa TO itab.
READ TABLE itab INTO e_wa WITH KEY xxxxxx
LOOP AT itab INTO e_wa... etc..
In a better approach we use Field symbols with such tables, instead of structures
FIELD-SYMBOLS: <fs_itab> TYPE t001.
So,
LOOP AT itab ASSIGNING <fs_itab>
READ TABLE itab ASSIGNING <fs_itab> etc.. However we can not use field symbols in few cases..
I hope this will help you..
Thanks and Best Regards,
Vikas Bittera.
**Points for usefull answers**

What are the main tables using in vendor performance report.

what are the main tables using in vendor performance report.
how many select statements are in ABAP reports.

Refer the links -
vendor performance report !!!
vendor performance report
vendor performance report
I need standard vendor performance report
Regards,
Amit
Reward all helpful replies.

What are all the tables used for this report:

hi
what are all the tables used for this report:
report:
Stock Report, which will give opening balance, receipt, issue, and closing balance for any given Duration for any material.
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Tables: MSEG, MKPF, MARD.
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Message was edited by: Sharath kumar R

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Passing Nested internal table to GUI_DOWNLOAD

Hi All
I have got a nested internal table, I want this whole report in excel format, I tried using GUI_DOWNLOAD , it gives error. Does any body have any idea how can I solve this.
regards
AJ

Hi,
I think nested and deep structure internal tables will not work with gui_download.
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The type of the database table and work area (or internal table)...

Hello
I am trying to use a database and select all records from it and store them into an internal table.
My code:
Select * from xixi_dbcurrency into table gt_currency.
The error:
"The type of the database table and work area (or internal table) "GT_CURRENCY" are not Unicode-convertible . . . . . . . . . .     "
Any suggestions?
Thank you

Hi Thomas,
Thank you for your inputs above.
But as you suggested is we use INTO CORRESPONDING FIELDS OF TABLE then it resolve the error.
But I have below piece of code:
DATA:    it_new_source TYPE STANDARD TABLE OF _ty_s_sc_1,
              wa_source TYPE _ty_s_sc_1,
              wa_new_source TYPE _ty_s_sc_1,
              ls_target_key TYPE t_target_key.
SELECT * INTO CORRESPONDING FIELDS OF TABLE it_new_source
       FROM /bic/afao06pa100
       FOR ALL ENTRIES IN SOURCE_PACKAGE
       where /bic/fcckjobno = SOURCE_PACKAGE-/bic/fcckjobno
       and /bic/fcckjitid = SOURCE_PACKAGE-/bic/fcckjitid.
But since this is reading into corresponding fields of table the data load from one DSO to other DOS is running for long more that 15 hours and still not getting completed and giving dump.
So if I switch the search to below:
SELECT * FROM /bic/afao06pa100
   INTO TABLE it_new_source
       FOR ALL ENTRIES IN SOURCE_PACKAGE
       where /bic/fcckjobno = SOURCE_PACKAGE-/bic/fcckjobno
       and /bic/fcckjitid = SOURCE_PACKAGE-/bic/fcckjitid.
Then I am getting below error:E:The type of the database table and work area (or internal table) "IT_NEW_SOURCE" are not Unicode convertible.
Can you please advice on this, as performance need to improve in start routine code.
Thank You.

Problem reading data from nested internal table.

Hi,
Below is my code;
*********SAP Code********
TYPES: BEGIN OF v54a0_scdd,
 fknum LIKE vfkk-fknum,
 change LIKE vfkkd-updkz,
 x TYPE v54a0_scd,
 y TYPE v54a0_scd,
 tvtf LIKE tvtf,
 END OF v54a0_scdd.
SCD table for dialog
TYPES: v54a0_scdd_tab TYPE v54a0_scdd OCCURS 1.
*********SAP Code********
*Custom declaration*****
data: wa_freight_costs type v54a0_scdd_tab.
data: it_freight_costs type v54a0_scdd_tab occurs 0.
*****Here data is getting appended to it_freight_costs. P_frieght_costs is coming from standard program.
 move p_freight_costs TO wa_FREIGHT_COSTS.
 append wa_freight_costs to it_freight_costs.
 clear wa_freight_costs.
***Now the problem is here. I am not able to read the data from the nested internal table x-item.
if i use <fs_f_costs> to move data from it_freight_costs in the outer loop, i get a syntax error; "the line type of the table it_freight_costs is not compatible with field symbol type <fs_f_costs>" 
 FIELD-SYMBOLS: <fs_f_costs> type line of v54a0_scdd_tab.
 LOOP AT it_freight_costs assigning <fs_f_costs>.
 LOOP AT <fs_f_costs>-x-item ASSIGNING <fs_freight_item>.
 I want to read <fs_freight_item>-vfkp-netwr.
 ENDLOOP.
Can anyone guide me?

A quick look at how I would do this. Note I haven't checked if this compiles just done a quick brain-dump.
DATA: lr_f_costs TYPE REF TO v54a0_scdd_tab,
 lr_f_cost TYPE REF TO v54a0_scdd.
LOOP AT it_freight_costs REFERENCE INTO lr_f_costs.
 LOOP AT lr_f_costs->* REFERENCE INTO lr_f_cost.
 ENDLOOP.
ENDLOOP.
As you can see I personally prefer pointers to field symbols - I don't believe there is any performance differences and because of my background in other languages pointers make more sense to me.
Cheers
Graham Robbo

What are the payment tables in R12?

Hello,
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I need retrieve the below columns from tables in R12
Payment_id,
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Payment_num, Payment_amount
please help us,
Thanks,
Raj

Hello,
Thanks for your helping,
1). DUNS_NUMBER
2). JP_DUNS_NUMBER
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What are nested Internal tables

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