Why DECODE can only be used in sql statement

Hi,
Why the sql1 works but sql2 doesn't.
sql 1 ) Select decode(1,0,0,1) into var from dual;
sql 2 ) var = decode(1,0,0,1);
Kindly clarify.
Regards,
Kishore

Hi Purvesh,
2nd works fine for 11g onwards.
Really?
Got the same error when executed the below (on Oracle 11.2.0.3.0)
SQL> DECLARE
  2    var_x NUMBER := 1;
  3    var_y VARCHAR2(10);
  4  BEGIN
  5    var_y := Decode(var_x, 1, 'Yes', 'No');
  6    Dbms_Output.PUT_LINE('var_x: '||var_x);
  7    Dbms_Output.PUT_LINE('var_y: '||var_y);
  8  END;
  9  /
  var_y := Decode(var_x, 1, 'Yes', 'No');
ERROR at line 5:
ORA-06550: line 5, column 12:
PLS-00204: function or pseudo-column 'DECODE' may be used inside a SQL
statement only
ORA-06550: line 5, column 3:
PL/SQL: Statement ignored
Please explain me the same.

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