about abap

[Former Member]

hai,

now iam learning sap i want operations performed on internal table.

[Former Member]

Hi,

search the forum with internal table.you will get valuable material.

[Former Member]

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. Header Line(optional) & Body(Compulsory).

Any value that comes to or goes from interanal table , that travels through headerline.

<b>*A related program is .</b>

<b>*declaration</b>.

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

<b>*initializing headerline</b>

 internaltable-x = 'd'. 
   internaltable-y = 34.

<b>*storing value into internal table</b>

append internaltable .  
append internaltable . 
append internaltable .

<b>*reading internal table</b>

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

<b>Fields of Internal Tables</b>

<b>SY-TABIX</b>

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.

<b>APPEND</b> 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.

<b>COLLECT</b> 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.

<b>LOOP AT</b> 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.

<b>READ TABLE</b> 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.

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

<b>SY-TFILL</b>

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

<b>SY-TLENG</b>

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

<b>SY-TOCCU</b>

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

Reward points if helpful.