The TO_NCLOB function in Oracle SQL / PLSQL is used to convert a LOB value to NCLOB value.
Syntax for the TO_NCLOB function in Oracle SQL / PLSQL is:
SELECT TO_NCLOB(expression_1)
FROM table_name;
expression_1 can be CHAR, VARCHAR2, NCHAR, NVARCHAR2, CLOB or NCLOB
Examples:
SELECT TO_NCLOB(employee_name) FROM employee;