Oracle Data types

I created a table with several columns and one of them is a LONG RAW datatype and when I try to modify another column from VARCHAR2 to LONG using ALTER TABLE ... MODIFY(... LONG); it keeps giving me the following error and doesn't allow me to modify it.

ERROR at line 1:
ORA-01754: a table may contain only one column of type LONG

so does it mean that I can't have more than one column with the type anything which starts with LONG.

please throw some light.

Ravi

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