ABAP Select data from SAP table PIQ_NL_PREVIOUSEDU into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

Below is a number of ABAP code snippets to demonstrate how to select data from SAP PIQ_NL_PREVIOUSEDU table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to PIQ_NL_PREVIOUSEDU. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the PIQ_NL_PREVIOUSEDU table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_PIQ_NL_PREVIOUSEDU TYPE STANDARD TABLE OF PIQ_NL_PREVIOUSEDU,
      WA_PIQ_NL_PREVIOUSEDU TYPE PIQ_NL_PREVIOUSEDU,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <PIQ_NL_PREVIOUSEDU> TYPE PIQ_NL_PREVIOUSEDU.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PIQ_NL_PREVIOUSEDU.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PIQ_NL_PREVIOUSEDU
  INTO TABLE IT_PIQ_NL_PREVIOUSEDU.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PIQ_NL_PREVIOUSEDU
*  INTO TABLE @DATA(IT_PIQ_NL_PREVIOUSEDU2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_PIQ_NL_PREVIOUSEDU INDEX 1 INTO DATA(WA_PIQ_NL_PREVIOUSEDU2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PIQ_NL_PREVIOUSEDU ASSIGNING <PIQ_NL_PREVIOUSEDU>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PIQ_NL_PREVIOUSEDU>-TYPENAME = 1.
<PIQ_NL_PREVIOUSEDU>-BRINNUMBERPRE = 1.
<PIQ_NL_PREVIOUSEDU>-RESIDENCENO = 1.
<PIQ_NL_PREVIOUSEDU>-PREEDUCATION = 1.
<PIQ_NL_PREVIOUSEDU>-INSTITUTENAME = 1.

ENDLOOP.

LOOP AT IT_PIQ_NL_PREVIOUSEDU INTO WA_PIQ_NL_PREVIOUSEDU.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PIQ_NL_PREVIOUSEDU-PREEDUNAME, sy-vline,
  WA_PIQ_NL_PREVIOUSEDU-PREEDUEXTCODE, sy-vline,
  WA_PIQ_NL_PREVIOUSEDU-PREEDUEXTNAME, sy-vline,
  WA_PIQ_NL_PREVIOUSEDU-LOCATIONPRE, sy-vline,
  WA_PIQ_NL_PREVIOUSEDU-PREEDUEXTCOUN, sy-vline,
  WA_PIQ_NL_PREVIOUSEDU-GRADUATED, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PIQ_NL_PREVIOUSEDU you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_PIQ_NL_PREVIOUSEDU TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_PIQ_NL_PREVIOUSEDU INTO WA_PIQ_NL_PREVIOUSEDU.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_PIQ_NL_PREVIOUSEDU_STR, 
TYPENAME TYPE STRING,
BRINNUMBERPRE TYPE STRING,
RESIDENCENO TYPE STRING,
PREEDUCATION TYPE STRING,
INSTITUTENAME TYPE STRING,
PREEDUNAME TYPE STRING,
PREEDUEXTCODE TYPE STRING,
PREEDUEXTNAME TYPE STRING,
LOCATIONPRE TYPE STRING,
PREEDUEXTCOUN TYPE STRING,
GRADUATED TYPE STRING,
GRADYEAR TYPE STRING,
GRADMONTH TYPE STRING,
GRADDAY TYPE STRING,
PREEDUSIGNALCODE TYPE STRING,
SUBJECTS_DETAILS TYPE STRING,
VERIFCERTSTATUS TYPE STRING,
VERIFICATIONDATEPRE TYPE STRING,
VERIFIEDBRINPRE TYPE STRING,
VERIFIEDINSTIT TYPE STRING,
VERIFIEDEMP TYPE STRING,
VERIFACCEPT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PIQ_NL_PREVIOUSEDU_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_PIQ_NL_PREVIOUSEDU_STR-TYPENAME sy-vline 
WA_PIQ_NL_PREVIOUSEDU_STR-BRINNUMBERPRE sy-vline 
WA_PIQ_NL_PREVIOUSEDU_STR-RESIDENCENO sy-vline 
WA_PIQ_NL_PREVIOUSEDU_STR-PREEDUCATION sy-vline 
WA_PIQ_NL_PREVIOUSEDU_STR-INSTITUTENAME sy-vline 
WA_PIQ_NL_PREVIOUSEDU_STR-PREEDUNAME sy-vline 
WA_PIQ_NL_PREVIOUSEDU_STR-PREEDUEXTCODE sy-vline 
WA_PIQ_NL_PREVIOUSEDU_STR-PREEDUEXTNAME sy-vline 
WA_PIQ_NL_PREVIOUSEDU_STR-LOCATIONPRE sy-vline 
WA_PIQ_NL_PREVIOUSEDU_STR-PREEDUEXTCOUN sy-vline 
WA_PIQ_NL_PREVIOUSEDU_STR-GRADUATED sy-vline 
WA_PIQ_NL_PREVIOUSEDU_STR-GRADYEAR sy-vline 
WA_PIQ_NL_PREVIOUSEDU_STR-GRADMONTH sy-vline 
WA_PIQ_NL_PREVIOUSEDU_STR-GRADDAY sy-vline 
WA_PIQ_NL_PREVIOUSEDU_STR-PREEDUSIGNALCODE sy-vline 
WA_PIQ_NL_PREVIOUSEDU_STR-SUBJECTS_DETAILS sy-vline 
WA_PIQ_NL_PREVIOUSEDU_STR-VERIFCERTSTATUS sy-vline 
WA_PIQ_NL_PREVIOUSEDU_STR-VERIFICATIONDATEPRE sy-vline 
WA_PIQ_NL_PREVIOUSEDU_STR-VERIFIEDBRINPRE sy-vline 
WA_PIQ_NL_PREVIOUSEDU_STR-VERIFIEDINSTIT sy-vline 
WA_PIQ_NL_PREVIOUSEDU_STR-VERIFIEDEMP sy-vline 
WA_PIQ_NL_PREVIOUSEDU_STR-VERIFACCEPT sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.