To fill an internal table, you can either append data line by line, or you can copy the contents of another table.

To fill an internal table line by line, you can use either the APPEND, COLLECT, or INSERT statements.

• To use an internal table just for storing data, you are recommended to use APPEND for performance reasons. With APPEND, you can also create ranked lists.

• To calculate totals of numeric fields or to ensure that no duplicate entries occur in an internal table, use the COLLECT statement which processes lines depending on the standard key.

• To insert a new line before an existing line in an internal table, use the INSERT statement.

To copy the contents of one internal table into another one, use the variants of the APPEND, INSERT, or MOVE statements.

• To append lines of an internal table to another internal table, use a variant of the APPEND statement.

• To insert lines of an internal table in another internal table, use a variant of the INSERT statement.

• To copy the entire contents of an internal table into another internal table, and overwrite that target table, use the MOVE statement.