Answer / anu

Append adds the record at the end of internal table.
Collect sums up the numeric fields of the records whose
primary keys are equal and adds it as a single record i.e
To fill an itab with lines which have unique standard keys
we use collect statement.If an entry with the same key
already exists,the collect statement does not append a new
line as append statement but adds the contents of the
numeric fields in the work area to the contents of the
numeric fields in the existing entry.

Answer / sagi.nagamani

collect : it gives the summarized record if all the
character fields of the work area matches with all
character fields of any record of the table body then it
adds its numeric fields .if not matched then it inserts it
as anew record.

append: it appends or inserts the record into the table
body as last record .

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