Userdefined datatype in Oracle 8i

The Table contains data of 50000 rows.
Please send
How to create userdefined datatype for a column in a table?
( Table : cs_orderdetail
Column : ordertype
datatype : torder as varchar2(6))
For the same Column How to add default?
( Table : cs_orderdetail
Column : ordertype
datatype : torder as varchar2(6)
default : 'custom')
For the same Column How to add Check constraint?
( Table : cs_orderdetail
Column : ordertype
datatype : torder as varchar2(6)
default : 'custom'
check : 'back', 'custom', 'refill')
null

Timestamp was a new globalization feature in 9i. The only way to handle time in 8i is with the regular DATE type and traditional date arithmetics.

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