Operations on Internal Tables

Operations on Internal Tables

Various operations can be performed on an Internal Table.
Filling Internal Table
->For filling an IT , use the keyword ‘APPEND’
->It appends the contents of the work area at the end of the Internal Table.
Eg: APPEND wa TO itab.

Modifying lines of IT
->To modify individual lines of an IT,use “MODIFY” stmt inside the loop.
->However you must make the required changes in the work area and then assign its contents to the IT.
->MODIFY FROM.

Deleting single table lines
->You can delete single table lines using ‘DELETE’ stmt within the loop.
->DELETE stmt deletes the current line of IT.
->DELETE.

Sorting
->To sort IT will use SORT keyword.
->You can also specify the sorting sequence with SORT and type (ascending/descending).
->SORT BY fieldname.
Ex. SORT BY EID.

LOOP AT stmt..
->IT are processed in loops.in loops all elements of the IT are read starting from the first line.
SYNTAX :LOOP AT itab.
ENDLOOP
For work area,
LOOP AT itab into wa.
ENDLOOP.

Outputting Table contents

->To display the table contents use ‘WRITE’ stmt inside the LOOP AT loop.
Ex: Write:/itab-field1,itab-field2.

Processing control levels

->It allows you to create statement blocks within a LOOP-ENDLOOP loop that are processed only for certain table lines.
->Start with AT and end with ENDAT.
AT.
ENDAT.

->FIRST-first line of IT
->LAST-last line of IT
->NEW-beginning of a group of lines with same contents in the superior fields.
->END OF-end of a group of lines with same contents in the superior fields.