Internal table in ABAP

*An internal table is a run time instance.  It get created when program starts execution.
*It get destroyed when program terminates. it has two different parts.  HeaderLine(optional) & Body(Compulsory).
*Any value that comes to or goes from interanal table , that travels through headerline.\

*A related program is .

*declaration.
data: begin of inernaltable occurs 0,
         x type c,
         y type i,
      end of itab.

*initializing headerline
   internaltable-x = 'd'.
   internaltable-y = 34.
  
*storing value into internal table

appene internaltable . 
appene internaltable .
appene internaltable .

*reading internal table
loop at itab .
   write: / internaltable-x, internaltable-y.  "writes to output list
endloop.

ABAP Tips by : Abdul Sayeed
Email : sayeed_mail2005@yahoo.com

Fields of Internal Tables

SY-TABIX

Current line of an internal table. SY-TABIX is set by the statements below, but only for index tables. The field is either not set or is set to 0 for hashed tables. 

APPEND sets SY-TABIX to the index of the last line of the table, that is, it contains the overall number of entries in the table. 

COLLECT sets SY-TABIX to the index of the existing or inserted line in the table. If the table has the type HASHED TABLE, SY-TABIX is set to 0.

LOOP AT sets SY-TABIX to the index of the current line at the beginning of each loop lass. At the end of the loop, SY-TABIX is reset to the value that it had before entering the loop. It is set to 0 if the table has the type HASHED TABLE. 

READ TABLE sets SY-TABIX to the index of the table line read. If you use a binary search, and the system does not find a line, SY-TABIX contains the total number of lines, or one more than the total number of lines. SY-INDEX is undefined if a linear search fails to return an entry. 

SEARCH <itab> FOR sets SY-TABIX to the index of the table line in which the search string is found.

SY-TFILL

After the statements DESCRIBE TABLE, LOOP AT, and READ TABLE, SY-TFILL contains the number of lines in the relevant internal table. 

SY-TLENG

After the statements DESCRIBE TABLE, LOOP AT, and READ TABLE, SY-TLENG contains the length of the lines in the relevant internal table. 

SY-TOCCU

After the statements DESCRIBE TABLE, LOOP AT, and READ TABLE, SY-TLENG contains the initial amount of memory allocated to the relevant internal table.

Fast Links:
Get help for your ABAP problems
Do you have a ABAP Question?

SAP Books
SAP Certification, Functional, Basis Administration and ABAP Programming Reference Books

ABAP Tips
ABAP Forum for Discussion and Samples Program Codes for Abapers

Best regards,
SAP Basis, ABAP Programming and Other IMG Stuff
http://www.erpgreat.com

All the site contents are Copyright © www.erpgreat.com and the content authors. All rights reserved.
All product names are trademarks of their respective companies.  The site www.erpgreat.com is in no way affiliated with SAP AG.
Every effort is made to ensure the content integrity.  Information used on this site is at your own risk.
 The content on this site may not be reproduced or redistributed without the express written permission of
www.erpgreat.com or the content authors.