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Modify a cloumn data type

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hi everyone i am new on Oracle...


i created a table
create table UNI
Quote:

(UNAME varchar2(1),
UNIID number(5),
UADDRESS varchar2(20),
URANK number(4),
PCode number(4)
);
the problem on first line
Quote:

UNAME varchar2(1)
i want change this
Quote:

UNAME varchar2(12)

plz help me out this problem..
thanks..

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