Answer Posted / sateesh

Clear: Clear is used to clear the memory of the workarea
and Internal table.
Refresh : It is used to clear only the Internal table
memory.
FREE: It is use to clear the workarea,internal table at the
same time it will return the free memory back to Database.
data: Lt_tab type table of MARA,
ls_tab type mara.
Syn: CLEAR ls_tab.
CLEAR lt_tab[] - But this is Obsulute in ECC6.0
SYN: Refresh LT_TAB.
SYN: FREE LT_TAB.

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