What are the rules to insert lines to internal tables? | SAP-ABAP

=>    Standard table-- The line is inserted at the end of the internal table. It has same effect as the APPEND statement.
=>    Sorted Table-- Depending upon the table key, line is inserted into the table. Duplicate entries are inserted above the existing entry with the same key, if the key is non-unique.
=>    Hashed tables-- The line is inserted into hashed table according to the table key.