| Oracle9i SQL Reference Release 2 (9.2) Part Number A96540-02  | 
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to_nchar_number::=
 TO_NCHAR (number) converts a number to a string in the NVARCHAR2 character set. The optional fmt and 'nlsparam' corresponding to n can be of DATE, TIMESTAMP, TIMESTAMP WITH TIME ZONE, TIMESTAMP WITH LOCAL TIME ZONE, INTERVAL MONTH TO YEAR, or INTERVAL DAY TO SECOND datatype.
SELECT TO_NCHAR(customer_id) "NCHAR_Customer_ID" FROM orders WHERE order_status > 9; NCHAR_Customer_ID ----------------- 102 103 148 149 148