Will you explain the meaning of, adding a astrisc (*) before a variable

Hi All,
Will you explain the meaning of, adding a astrisc (*) before a variable.
ex: *var1, *var2.

Hi ravi,
1. This is actually a facility provided in abap syntax.
2. It is usually checked while saving a record.
3. For eg.
   If we have one variable
   EKKO
and another *EKKO
(They both are same only, with same structure)
(but two different variables)
4. The functional meaning, for usage purpose,
of *EKKO is OLDEKKO.
5. While saving the transaction,
the data is saved only if there is any change
in the values.
IF EKKO <> *EKKO.
*--- SAVE
ELSE.
MESSAGE 'NO DATA CHANGED'
ENDIF.
6. We can aswell use any other variale
eg. oldekko
     oekko
     myekko
etc,
7. But for business meaning,
R/3 has the facility for *
regards,
amit m.

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Will you explain the meaning of, adding a astrisc (*) before a variable

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